Premium and Economy In-Line Duct Back Draft Blockers

In-Line Draft-Blockers

Premium In-Line Back Draft Dampers are specifically designed to stop backdrafts from your clothes dryer, bathroom exhaust fan, kitchen exhaust fan. Tested to ASTM E84, UL723 and NFPA 255 standards for flame resistance.

Premium 4 in. Damper $28.00

Premium 5 in. Damper $30.00

Premium 6 in. Damper $32.00

Premium 7 in. Damper $34.00

Premium 8 in. Damper $36.00

Economy 4 in. Draft Blocker $5.00
(Economy unit only for use with 4 in. bath fans and clothes dryers)


Our Premium In-Line Back Draft Dampers!

Our Premium Back Draft Damper is a non-mechanical in-line one way air flow valve that requires minimal pressure to operate, has no moving parts and tested to ASTM E84, UL 723 and NFPA 255 standards.

Get the full force of your fan with this non-restrictive damper which fits snugly inside the duct.

5 sizes available.

Our Premium Back Draft Damper is the ultimate one way air flow valve, designed to overcome the inefficiencies and limitations of traditional gravity or butterfly dampers.

The damper consists of a specially formulated fabric sleeve attached to an outer metal sleeve.

The fabric sleeve will allow air to pass through in the desired direction of flow with miniscule reduction in airflow.

Our Premium Back Draft Damper is the best damper available. It is superior in that it allows unrestricted airflow in the desired direction without reducing system efficiency.

It is silent, produces no metal clanging sounds, tested to ASTM E84, UL723 and NFPA 255 standards, and can be installed at any angle in horizontal or vertical ductwork.

Specifically designed to stop backdrafts from your clothes dryer, bathroom exhaust fan, kitchen exhaust fan.

Tested to ASTM E84, UL723 and NFPA 255 standards for flame resistance.

Available in 4, 5, 6, 7, and 8 in. sizes!

Installs easily - simply slide into duct.

4 inch damper is 3-7/8 inch O.D. and 5-1/8 inch long.

5 inch damper is 4-7/8 inch O.D. and 6-1/2 inch long.

6 inch damper is 5-7/8 inch O.D. and 7-5/8 inch long.

7 inch damper is 6-7/8 inch O.D. and 9-1/2 inch long.

8 inch damper is 7-7/8 inch O.D. and 11 inch long.

"During the windy winter months, the damper keeps performing with NO CLANGING!" - Sara P., Wasilla, AK.

Premium In-Line Draft Blocker prevents backdrafts.

Installs into rigid or flexible duct. Sized 1/8 inch less than inside diameter of duct for a snug fit. Rubber gasket provides air tight seal.

Our Economy Bathroom Exhaust Fan Draft Blocker!

Stop Air Drafts Through Your Bathroom Fan!
Fits Any Bath Fan Standard 4" Duct!

Save on your home heating costs with our Bath Exhaust Fan Draft-Blocker!

Have you ever noticed that your bathroom is uncomfortably cold - perhaps even one of the coldest rooms in your house? Ever wonder why??

If you have an exhaust fan in your bathroom, it is connected to a 4" diameter exhaust duct that is open to the outdoors. In the winter, cold air leaks in through the duct and into your bathroom, while your heated air just pours right out! This is a substantial energy-loser that causes cold drafts to enter your bathroom and house!

Many common bath exhaust fans use a single plastic flapper to attempt to reduce this air leakage. This does not provide a positive seal to stop the air leakage. This is like leaving a window open! Conventional bath fans can allow hot air into your home during the summer months, and cold air in during the winter.

The Solution - Install a Bath Exhaust Fan Draft-Blocker!

Our Bath Exhaust Fan Draft-Blocker will reduce unwanted air infiltration, reducing cold drafts and saving energy costs!

What is the Bath Exhaust Fan Draft-Blocker?

Our Bath Exhaust Fan Draft-Blocker is a one-way air-flow device that helps prevent air flow into the house.

How Does the Bath Exhaust Fan Draft-Blocker Work?

The Bath Exhaust Fan Draft-Blocker is simply spliced into the exhaust duct. A pair of duct clamps are included.

Benefits of the Bath Exhaust Fan Draft-Blocker!

* Save heat and air conditioning costs!
* Stops uncomfortable drafts!
* Keep out pests, bees and rodents!
* Reduce unwanted air infiltration!
* Fits any standard 4" diameter bath exhaust fan duct!
* Easy to install with zip ties into flexible duct - complete instructions provided!
* Plastic louvers close by gravity - must be installed horizontally.
* NOTE: ONLY fits flexible duct in 4 inch size.
* NOTE: Can rattle and make noise.


Economy In-Line Draft Blocker