BD image NEW ECV-345 Severe Duty Louver is Best in Class!

The ECV-345 louver is engineered and tested to withstand extreme loads, debris impact, and cyclic fatigue associated with the severe weather effects of hurricanes. The design uses closely-spaced blades and a frame with built-in gutter and downspouts to achieve maximum water infiltration resistance for minimal louver depth. Features industry leading wind-driven rain and water penetration performance.

• AMCA 540/550 Listed
• AMCA Certified for Water Penetration, Air Performance and Wind-Driven Rain
• AMCA 500-L Wind-Driven Rain Test – Class A


Latest News


Pottorff Announces NEW Louver Insect Screen

Our improved louver insect screen features a top-quality product and a clean appearance. Additionally, we are offering a fully removable and replaceable bird screen option when regular maintenance and cleaning is required. Default insect screen is now fiberglass but we still offer an option for aluminum if required.

NEW Duct Connection Options for our Wood Truss System Dampers

When the CFD-521-IP and CFD-521-NP dampers are configured to close within 1/8” of the top of the gypsum board used in wood truss floor/ceiling and roof/ceiling assemblies, duct connections can now be made on the top of the damper, or any combination of sides of any size. This applies for all standard installations. Additionally, the plenum height can now be extended to allow duct connections in roof/ceiling assemblies with increased insulation to adhere to new, more stringent guidelines.

NEW EFD-635 Drainable Blade Louver Outperforms the Competition!

The EFD-635 drainable blade louver is designed to prevent.water penetration in non-wind-driven rain applications by collecting water in frame and blade gutters and channeling it into downspouts and away from airflow paths. The EFD-635 is available in a wide array of anodized and painted finishes including custom color matching.

High Free Area of 60.7%
1250 FPM @ Beginning Point of Water Penetration
AMCA Certified for Water Penetration and Air Performance

View EFD-635 Catalog Sheet


Pottorff's Recent Case Study

The 1.5 billion dollar Seminole Hard Rock Hotel and Casino resembles an authentic guitar and features 600 suites as well as a 41,000 sq. ft. spa, lagoon pool, lake, shops and restaurants. Pottorff supplied our ECD-545-WD and ECV-645-MD severe duty louvers for this project.

See the Super Bowl Sunday video featuring this project.


Pottorff's LIST Tool Redesign Showcased in the January ASHRAE Journal

Our popular LIST Louver Information and Selection Tool was recently redesigned with more search parameters and a fully responsive design. There is no need to register to use this valuable online program and you can export your schedule directly into our SPECs pricing program.

NEW Slot Diffuser Mounted Controller for our Remote Manual Balancing Dampers

The Slot Diffuser Mounted Controller allows for easy mounting of the RCS-10 and RCS-10R, reducing the labor needed to install these dampers when used with slot diffuser applications. Can be easily adjusted using a 7/32” socket or the optional RCS-15R adjustment tool.


Pottorff Announces NEW Field Supplied Steel Plenum for CFD-521-NP Ceiling Radiation Damper

Field supplied steel plenums can now be used with our CFD-521-NP for duct connections in wood truss floor/ceiling and roof/ceiling assemblies where fiberglass insulated plenums are not allowed.

Pottorff Signs Agreement to sell its Noise Control Product Division to Metal Forms Manufacturing Inc.

Pottorff has signed a definitive agreement to sell its Noise Control products division (with the exception of acoustical louvers), and the Dynasonics brand name, to Metal Form Manufacturing Company, Inc. (Metal Form). This move will provide additional resources and capacity to support Pottorff’s robust louver and damper growth and reinforce our commitment to be the easiest to do business with. Pottorff will continue to accept Noise Control product orders thru December 24, 2019 for shipment no later than January 23, 2020.  All Noise Control product orders received after December 24, 2019 will be forwarded to Metal Form for their review and reassignment under the Dynasonics brand.  


Pottorff Announces NEW Field Supplied Steel Plenum for our CFD-521-NP

Pottorff is pleased to announce a field supplied steel plenum for our CFD-521-NP ceiling radiation damper. These can now ne used for duct connections in wood truss floor/ceiling and roof/ceiling assemblies where fiberglass insulated plenums are not allowed.

Installation Instructions

Exciting Upgrades to Our Popular LIST Louver Information and Selection Tool (LIST)

When Pottorff launched LIST 5 years ago, it was industry leading software that gave users the ability to select and size louvers given a multitude of selection criteria for any project requirement. Since its inception, it has attained widespread adoption among pottorff representatives, as well as the engineering and architectural communities.

Our new upgrade features:
• More Search Parameters
• Fully Responsive, Intuitive Design
• No Need to Register to use the Tool, Register To Save Priojects
• Save Product Schedule as PDF or Excel; Option to Save to Import into our SPECs Pricing Tool
View Video
Download Marketing Sheet

Pottorff Sponsors October AMCA Webinar - Oct. 23, 2pm Eastern Daylight TIme

AMCA's October webinar features updates on codes, standards and certifications for severe-duty louvers and fire/smoke dampers. Discussion will include changes in the 2019 editions of NFPA 80 and NFPA 105 and code requirements for louvers in hurricane-prone regions.
To Register

Pottorff Announces Increased Duct Connections for Wood Truss Ceiling Radiation Damper

Our CFD-521 Wood Truss Ceiling Radiation Damper features increased duct connections and mounting options. When the damper is configured to close within 1/8" of the top of the gypsum board, boot rails can be used to mount the damper to the assembly. Additionally, duct connections can be made on the top and on any combination of sides.

Pottorff's ECV-645-MD now Features Streamlined Installation

Our ECV-645-MD vertical blade, Miami-Dade louver now offers a streamlined installation with minimal hardware required. It is also 2017 Florida Building Code Approved, AMCA Certified for Water Penetration, Air Performance and Wind-Driven Rain and AMCA 540 and 550 Listed.

Pottorff Feaures Ad in the Florida Caribbean Architect Magazine in September

Our Miami-Dade louvers are featured in the Fall issue of the FBC. Our Miami-Dade hurricane louvers are AMCA Certified and AMCA 540 and 550 Listed, 2017 Florida Building Code Approved and Texas Department of Insurance Listed.

Pottorff has article in the September issue of AMCA InMotion Magazine

Pottorff features an ad on our severe duty louvers in the September issue of The ASHRAE Journal. Accompanying our ad is an article co-written by Doug Petty, Pottorff's Louver Product Manager. The article, entitled 'Improving Building Resilience with Severe-Duty Louvers', talks about the fact that more states are adopting building codes requiring severe duty louvers. View article

Pottorff's NEW High Performing Louvers Feature Drainable Performance at an Economical Price!

In order to improve performance for you and your clients, we have redesigned our non-drainable louvers. These louvers now have drainable heads and jambs meaning increased performance at no additional cost. 

• Best-in-Class Water Penetration Performance
• Get Drainable Performance at a Non-Drainable Price.

View Video

View Non-Drainable Louvers

NEW End Plenum adds Flexibility when installing our CFD-521-90 Ceiling Radiation Damper

Our new end boot option gives added adjustibility to the installer to allow for flex duct connection without crimping or turning when space is tight to the truss space. The addition of this boot to our CFD-521-90 will give you another option when choosing the right application for your jobs.


NEW CAR-T Constant Airflow Regulator with Transition

Pottorff is pleased to announce the release of our model CAR-T to complement our CAR constant airflow regulator. The CAR-T offers the CAR factory installed in a square to round or rectangular to round transition. This labor saver can help installers save time by offering an easy way to install round constant airflow regulators in a square or rectangular duct.

Model CAR-T constant airflow regulator with transition is designed to save a significant amount of money and energy by precisely controlling airflow to balance HVAC systems without the need for electrical or pneumatic controls and sensors.

CAR-T Catalog Page

CAR-T Installation Instruction

Pottorff Releases the PI-10 Indicator Switch Package for Curtain Type Fire Dampers

Our PI-10 switch package can be used to signal an alarm or fore control system to indicate blade closure on VFD dampers. The PI-10 can be used on both static and dynamic, 1-1/2 hour rated and 3-hour rated dampers. It can be ordered factory mounted, or loose for field installation as an option on our VFD models. It can also be ordered as a stand-alone model for retrofitting installed VFD dampers that need this blade indication.

Pottorff Releases the CAR-FD Constant Airflow Regulator with Fire Damper

Our model CAR-FD can be ordered with a static or dynamic curtain type fore damper that can be installed in fore rated walls rated up to two hours. The CAR-FD fire damper employs curtain style blades for point-of-origin control of fire in static or dynamic HVAC systems.


Introducing Expanded Modulating Actuator Options for Combination Fire/Smoke Dampers

The expanded Modulating Actuator options will allow our UL rated airfoil blade fire/smoke dampers to act as both life safety and air control dampers.

Pottorff is pleased to announce expanded modulating actuator options for our out-of-partition and horizontally mounted steel airfoil combination fire/smoke dampers. The Belimo FSAFB24-SR(S) modulating actuator can now be selected as an option on Pottorff's horizontally mounted  FSD-151 and FSD-152 dampers in assemblies up to 120" x 48" and on FSD-151-OP and FSD-152-OP dampers up to 36" x 24".

Pottorff Announces NEW Concealed Motor Louvers

Pottorff's NEW concealed motor louvers are designed to be used in any situation where our standard operable and combination louvers would be used, but where access to the actuator and hardware needs to be controlled or restricted.  The actuator will be concealed in the sill of the louver, and can be accessed internally (by default), externally, or both.


Increased Performance for Pottorff Airfoil Blade Fire/Smoke and Smoke Dampers!

Pottorff is pleased to announce increased performance ratings for our airfoil blade smoke and combination fire/smoke dampers. These dampers are now UL approved for Class 1 leakage at 4000 fpm and 8" static pressure at a maximum assembly size of 96" x 48". This assembly size makes these dampers the largest in the industry. These ratings cover combination fire/smoke dampers rated to 1-1/2 to 3 hours and Class 1 or Class 2 leakage as well as smoke dampers rated to Class 1 or Class 2.

• Maximum Dynamic Closure Velocity: 4000 fpm
• Maximum UL 555S Rated Pressure: 8 in. wg.
• Class 1 and Class 2 UL 555S Rated Leakage
• AMCA Certified for Air Performance
View Dampers

Pottorff's EOJ-690 Operable Louver Featured In The April Edition of The ASHRAE Journal

Our EOJ-690 high performing louver features 90 degree operable J-blades that range from closed to fully open and a drainable head frame. This results in a louver that protects openings from water penetration, while simultaneously providing a high free area product. A cost-saving advantage of high free area means that more air can enter into a smaller wall opening. This louver is ideal for warehouses or distribution type projects, where maximum airflow is required.

High Free Area: 68.5%
AMCA Certified for AIr Performance

View Ad


Our new CAR – Constant Airflow Regulator – is designed to save time and money by precisely controlling airflow to balance HVAC systems without the need for electrical or pneumatic controls and sensors. A self-regulating aero-wing and spring piston design automatically adjust for variable duct pressures caused by building duct design, thermal stack effect, dust build up filters, and other varying building conditions.

• Economical – no need for electronic/pneumatic actuators or sensors
• Available in standard, low and high pressures
• Field adjustable with only a screwdriver
• Sizes from 3-10 inches

View CAR Product Page

Pottorff's Constant Airflow Regulator Featured in ASHRAE Journal

Pottorff’s new CAR Constant Airflow Regulator is featured in the March issue of the ASHRAE Journal. The CAR features precise control of indoor air quality and is available in sizes from 3-10 inches.

View Ad

Pottorff's ECD-545-MD Features Superior Performance and Streamlined Installation

Our ECD-545-MD severe duty louver is engineered and tested to withstand the extreme loads, debris impact and cyclic fatigue associated with the weather effects from hurricanes and tropical storms.

AMCA 540 (Enhanced) Listing
AMCA 550 listed (with CD-51 damper)
2017 Florida Building Code Pending
Texas Department of Insurance Listed

View Product Page

Pottorff's Excellence in Air Management and Control Featured in January Issue of THE ASHRAE Journal

Our full-line of Louvers, Air Control Dampers, Fire and Smoke Dampers and Sound Control products is backed by our Industry Leading 5-year warranty.

View Ad

2019 Annual Pottorff Representative Principal Luncheon

Thank you to our representatives for a successful 90th Anniversary Luncheon and Awards Ceremony. This year’s event was held at the beautiful Commerce Club in Atlanta, Georgia. Over 120 of our reps viewed our recently and soon to be released products on the 49th floor of the club which overlooked Atlanta.

View Video

Mark Saunders accepts role as Pottorff's VP of Sales and Marketing

We are pleased to announce the hiring of Mark Saunders as our new Vice President of Sales & Marketing. Mark brings 20+ years of sales and marketing leadership expertise with him including 8-1/2 years with Pottorff as our Western Regional Sales Manager, 8 years with Titus as Marketing Manager and Regional Sales Manager, and most recently as Director of Sales & Marketing for Ruskin. 

Pottorff's high-performing louvers featured In November issue of THE ASHRAE Journal.

Pottorff louvers are designed and tested in-house to our own high standards for performance and reliability. Our exacting requirements means that you can be assured that our louvers meet or exceed industry regulations and your project criteria. Choose the right louver every time with LIST, our Louver Information and Selection tool.

View Ad

Pottorff has article in the November issue of AMCA InMotion Magazine

In the AMCA InMotion supplement of the November ASHRAE Journal, our Product Manager, Doug Petty, has written an informative article on "Specifying and Sizing Louvers to Limit Water Penetration." Doug says, "Over the life of a building, few issues can be more vexing then water infiltration. Not only can it affect the performanc of mechanical components, if not addressed, it can damage drywall, ductwork, and other building materials, leading to long-term contaminaion issues, such as mold and rust. Repairs can be costly and intrusive. For these reasdons, it is important to design an HVAC system to prevent water penetration into vulnerable areas.
Read the entire article here.

Pottorff XAV-545 FEMA Grille now Classified as a UL Windstorm Rated Assembly

Our XAV-545 5-1/2" deep, inverted V-blade FEMA grille is now classified as a UL Windstorm Rated Assembly. This model meets National Storm Shelter standards and is designed in accordance with FEMA 361 and FEMA 321 guidelines for storm shelters and safe rooms. It is also ICC-2014 compliant and AMCA Certified for Water Penetration and Air Performance.

NEW Ceiling Radiation Dampers with Labor Saving Boot Rail Installation

Pottorff is pleased to announce the addition of the CFD-521-90 and CFD-521-NP90 to its Wood Truss Ceiling Radiation Damper line. These dampers are designed to be installed in wood truss applications, offering a 28 gauge steel outlet box with boot rail installations. The CFD-521-90 comes with a factory installed 90 degree plenum while the CFD-521-NP90 is designed to be installed with a field-installed steel plenum.

The boot rail installation allows for connection directly to the bottom of the wood trusses to reduce labor during installation, and can be used in designs that use resilient channel to connect the gypsum board to the trusses, or in designs where the gypsum is fastened directly to the wood trusses.

UL 555C Listing: R14603
CSFM Listing: 3226-0368:104

Pottorff Control Dampers now AMCA Certified Class 1A Air Leakage

Pottorff is excited to announce that our CD-45 and CD-46 steel airfoil blade control dampers are now AMCA Certified for Class 1A Air Leakage. These dampers are certified to Class 1A and Class 1 leakage up to 6 inches of static pressure which puts them in compliance with current increased environmental regulation.

Pottorff Announces New EFJ-937-MD Miami-Dade Louver

Our new EFJ-937-MD dual-module louver is engineered and tested to withstand the extreme loads, debris impact, and cyclic fatigue associated with the severe weather effects of hurricanes. It is approved for use in Miami-Dade and Brower counties, and is listed under the 2017 version of the Florida Building code. It is an ideal choice for those geographic areas, or anywhere along the Atlantic or Gulf coasts where protection against severe weather is required.

* Free area of 53.9%
* Miami-Dade Approved
* Florida Building Code Listed
* AMCA 540 (impact Resistant) Listed
* AMCA 550 (High Velocity Rain Resistant) Listed
* AMCA Certified for Water Penetration, Air Performance and Wind-Driven Rain

NEW CFD-521-ST - First Ceiling Radiation Damper Approved for Cold-Formed Steel

Pottorff is pleased to announce the addition of the CFD-521-ST to its product line. It employs butterfly blades for point-of-origin control of radiant heat in HVAC systems. Installed horizontally in the ceiling membrane of combustible roof-ceiling assemblies with fire resistance ratings up to and including 1 hour.

Pottorff's NEW PEV-445 Elevator Ventilation Penthouse

The PEV-445 extruded aluminum penthouse is designed for elevator shaft and gravity ventilation applications.  The PEV-445 includes an SD-151, Class 1 smoke dampers that fails open for smoke evacuation.

Pottorff's New EFJ-937-MD features in the July issue of The ASHRAE Journal

The EFJ-937-MD dual-module louver is engineered and tested to withstand extreme loads, debris impact, and cyclic fatigue associated with the severe weather effects of hurricanes. For installation, the EFJ-937-MD offers multiple options requiring minimal hardware and assembly time. The EFJ-937-MD is AMCA 540 and 550 listed, making it ideally suited for use in hurricane-prone and wind-borne debris regions per the International Building Code.

Pottorff's Fire and Fire/Smoke Dampers Featured in the July Issue of the ASHRAE Journal

Pottorff’s fire and combination fire/smoke dampers now feature a UL approved, 3-sided retaining angle installation which allows damper installations without the need to install retaining angles around all 4 sides of the damper. An excellent option when space is tight.

Louver and Damper Product Training Class Held for our Representatives

On May 9-10, Pottorff held a product training class for our representatives. As well as learning the basics on our louvers and dampers, attendees had a tour of our manufacturing plant and in-house testing laboratories. Thanks to all of our attendees for taking the time out of their busy schedules to come to Pottorff and take part in this valuable training.

Pottorff announces NEW Bubble-Tight Control Damper

The CD-95R is a bubble-tight industrial control damper designed for isolation and decontamination applications. Bubble tight dampers are designed to have the lowest leakage ratings possible. Typical applications include industrial processing plants, laboratories, clean rooms, pharmaceutical facilities, nuclear facilities, DOE facilities, and other applications that require extremely low leakage. The CD-95R is tested for bubble tight leakage ratings in accordance with AMCA 500-D up to 30 in. wg (7.5kPa). 

• Leakage: In accordance with AMCA-500D

• Maximum Pressure: 30 in.wg.

• Maximum Velocity: 6,500 fpm


3-Sided Angle Installation for Pottorff Fire and Fire/Smoke Dampers

This UL Approved Installation will allow installers to use firestop caulk on one side of the damper in lieu of a traditional retaining angle. This allows damper installations tight to the ceiling, floor, or a wall without the need to install retaining angles around all four sides of a damper.

Pottorff's Ceiling Radiation Dampers Featured in the March issue of the ASHRAE Journal

Our CFD-521-IP and NP are featured in the March ASHRAE Journal. We have increased the allowance for these ceiling radiation dampers to make room for supply grilles with opposed blade dampers. They can now be ordered with up to a 4" clearance to allow room for a 3-1/2" deep grille.

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XAV-545 FEMA Aluminum Grille now meets ICC-500-2014

Our XAV-545 5" deep, inverted V blade grille meets the International Code Council (ICC) and the National Storm Shelter (NSSA) standards for design and construction requirements for storm shelters that provide a safe refuge from storms that produce high winds, hurricanes and tornadoes. Designed in accordance with FEMA 361 and FEMA 320 guidelines.

View Video

Pottorff announces addition of the RCS-15R Radial Blade Control Damper

Our new RCS-15R radial blade control damper offers an economical way to balance low pressure and velocity applications. This duct mounted damper has manual remote control cables that easily mount in the ductwork to allow adjustment in the face of diffusers. Available in diameters from 6” to 14”.

Pottorff announces addition of its new 90 degree operable louver - the EOJ-690

The EOJ-690 features 90 degree operable J-blades that range from the closed position to fully open. It also has a drainable head to aid in protecting openings from water penetration. it features a free area of 68.5%.

Expanded Size Ratings for Pottorff Airfoil Blade Fire and Fire/Smoke Dampers

We are pleased to announce expanded size ratings for our airfoil blade Fire and Combination Fire/Smoke Dampers. These dampers can now be ordered at a minimum height of 6” for installations where space is at a premium. The expanded size range will allow engineers to specify smaller duct heights to increase usable space between building stories.

Pottorff Ceiling Radiation Damper Clearance Allowance Increased

Pottorff has increased the allowance for our model CFD-521-IP and CFD-521-NP to make room for supply grilles with opposed blade dampers. These models can now be ordered with up to a 4” clearance to allow room for a 3-1/2” deep grille. This allows the option of using many additional steel grilles in wood truss floor/ceiling and roof/ceiling applications.