Shopping Cart

Your cart is empty.

Your cart is empty.

Therwen Backdraft Damper Duct Manual Volume Damper with Sleeve Stove Pipe Galvanized Sheet Adjustment Airflow Ducting Branch HVAC Air Balancing for Range Hoods, Fans(8 Inch, 1 Pc)

4.9 (8) Write Review
Free shipping on orders over $29.99

$35.99

$ 15 .99 $15.99

In Stock

1.:1


2.SizeName:4 Inch


  • Suitable Size: the bend end interface of air duct damper measures about 7-7/8 inches/ 20 cm in diameter while the other side is about 8 inches/ 20.32 cm in diameter and the height is about 6 inches/ 15.24 cm in height, which is suitable for inserting 8 inch ventilation duct
  • Easy to Install: you simply slide the air ducting damper into the pipe and screw it in an easy to adjust position, then hide the seam with tape to complete the installation; It is also recommended that you can seal all connections with pipe sealant to prevent air leakage and improve the efficiency of the HVAC system
  • Fit Most Occasions: the 8 inch vent ducting damper can be applied on most occasions including air conditioning, dryer vents, exhausts, range hoods, heating systems, fans, vents and other residential, commercial and industrial HVAC applications, practical tools to use
  • Use for Air Balance: the HVAC damper is a simple manual damper wrapped in galvanized iron sheet metal sleeves; Each branch should be fitted with an air duct damper to regulate the airflow by adjusting the position of the damper, which can help to redirect it to specific locations in the house; The 6 inch backdraft damper is not completely sealed, and it is applied for air balancing, not air termination
  • Galvanized Iron Material: the 8 inch vent ducting damper is made of quality galvanized iron with high hardness and high temperature resistance, not easy to deformation and corrosion, and can effectively prevent the air duct damper from moisture and fading, which can be applied for a long time


Product Description

1
1
1

1

Thickened galvanized iron material, corrosion and high temperature resistance, not easy to deform.

1

The handle has an adjustment range of 0-90°, making it easy to operate and use.

1

Corrugated metal cuffs for a beautifully and simple look.

1

mike
2025-08-10 12:18:58
Works great shuts the air off almost completely. Well made.
Copper3383
2025-07-09 14:45:25
Great fitment and the quality of metal and design is superb. The 6 inch modulate air perfectly either doing a manually or with zone actuators by removing the handle. 10 out of 10!
Myztro
2025-06-26 16:05:36
Works well. A litttle rust forming by handle pivot but motor running strong.
Customer
2025-06-17 18:34:23
Construction is good, these are not made with cheap material, very sturdy, well made. Work perfectly, fit as it should. If you buy 2, you get a nice deal.
Customer
2025-04-01 10:56:48
Very heavy duty and a great value.
Mack A. Hupp Sr.
2025-03-18 12:41:58
Super fast ordering, I parked the first time
Chris Parrillo
2024-12-23 21:10:01
Purchased 3 for ERV duct. Very satisfied. The metal is solid. The damper handle opens/closes easily, with a wing nut to tighten in place. The round damper fits inside the duct evenly and squarely. Very well made.
Doc Turner
2024-11-23 10:48:39
When I bought my rv, I noticed that the furnace was totally out of balance and dumped all of the air into the living area and hardly any air was going to the rest of the trailer. I tried blocking the vent with plastic and tape, but neither worked. I placed this damper in the line going to the living area and suddenly had infinite control of the flow to the area. I only had to make a slight adjustment, but the result was perfect. The other part of the trailer now has better flow, and the heat distribution issue with the furnace is resolved. The valve is easy to adjust and the lock screw insures the valve will stay where you set it.