Why is the damper on my bath fan stuck?

Elyssa Littel asked a question: Why is the damper on my bath fan stuck?
Asked By: Elyssa Littel
Date created: Fri, Apr 16, 2021 10:21 PM

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Top best answers to the question «Why is the damper on my bath fan stuck»

  • If the damper won’t open, the fan may drive enough air through the duct to cause condensation, but not enough to warm the duct and dry it out. There’s a damper on the fan housing too, but the outside damper is much more likely to stick. Find the vent hood on your roof or exterior wall. Make sure the damper isn’t obstructed or stuck.

FAQ

Those who are looking for an answer to the question «Why is the damper on my bath fan stuck?» often ask the following questions:

❔ How to check if your bathroom fan damper stuck?

Let’s have a look at each and see what you can do about it… One of the most common reasons why the bathroom exhaust fan is leaking water is a damper stuck open. Bathroom fans have two dampers, one at the housing and one on the roof, where the duct exits the house. Interior dampers rarely get stuck, and when they do, they prevent the fan from expelling hot air and moisture. However, the ...

❔ How to tell if damper is stuck on bathroom fan?

The Dampers Are Stuck. There are two dampers for a bath fan, one at the housing and another where the duct exits the building. If they don’t open easily or open only partly, airflow will be weak. Try moving the exterior damper by hand to make sure it opens easily. Clean away any debris that might hinder movement. Interior dampers rarely stick, but if you suspect trouble, remove the grille and push open the damper with a stiff wire. The Bathroom Is Too Airtight. A fan can only drive air out ...

❔ How does damper work bath exhaust fan?

The gaps around the damper are there due to physics. Without air flow around the damper to initiate the movement to open the damper, the force of air would be insuffecient to open the damper to exhaust the air. As far as I know, all exhaust fans are designed the same way.

9 other answers

The Outside Damper Is Stuck. If the damper won’t open, the fan may drive enough air through the duct to cause condensation, but not enough to warm the duct and dry it out. There’s a damper on the fan housing too, but the outside damper is much more likely to stick. Find the vent hood on your roof or exterior wall.

Unfortunately, when the sealant strip gets hot from the sun beating on the cap all day, it gets sticky. Eventually, the damper gets completely stuck to the sealant strip, which prevents the damper from opening. This is what causes the black staining in the attic that you see pictured above.

The gaps around the damper are there due to physics. Without air flow around the damper to initiate the movement to open the damper, the force of air would be insuffecient to open the damper to exhaust the air. As far as I know, all exhaust fans are designed the same way.

The reason the damper wouldn’t open was that when the ductwork was attached to the fan, it was mushed up against the damper, impeding its ability to function. The old fan — probably installed in the 1990s — never did anything but use electricity to make noise for all that time.

However, the damper might not always need to be replaced, after inspecting the situation, you may find that the damper flap is just stuck open. Simply move the flapper with your hand back into place so it is blocking the air duct. Even with a damper flap, cold drafts can still find their way in, especially on those bitter windy winter days.

Adding insulation around the duct may solve the problem. The fan’s damper can also get stuck in the open position, allowing hot air into the cool duct and creating condensation. Check the small damper at the fan. It should open when the fan is on and close when the fan turns off.

If the fan was operating but it didn't seem to be moving air out of the bathroom, the damping plate may be stuck. Probe inside the vent opening with your finger until you feel it and then give it a gentle push. If it doesn't open easily, spray lubricant on its hinge points and then work the plate back and forth until it moves freely.

Another cause for knocking is a large piece of debris stuck on the fan. Grinding . It’s not uncommon for there to be a buildup of dirt, grime, and debris on the fan. Over time, it can cause a grinding sound as the fan blades are spinning. If the fan isn’t cleaned, the debris can damage it permanently.

It's usually a very simple task to pull the cover and the motor plate--as little as one screw holds it in place. Most fan motors have cord plugs that allow easy detachment from the fan housing. If that's not the issue, remove the plate and determine that the air flap on the fan housing functions as expected and is not obstructed.

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