Rigid ducts are the best choice for a bathroom fan in terms of performing the purpose of venting air and moisture from the bathroom.
What size duct do I need for bathroom exhaust fan?
When sizing a vent fan, a factor to consider is duct size and length. Most 50 CFM fans will run well with 4-inch round duct. But as you get up into the higher CFM fans, duct size will have to be increased to 5- or 6-inch round duct.
Can I use dryer duct for bathroom fan?
A bathroom fan and a dryer should never share the same vent. International building code states that dryer vent exhaust systems must be separate from all other systems and must expel moisture out of the house through a dedicated vent. This is because of the potential hazards associated with improper dryer venting.
Can you use flex duct for exhaust?
No. Avoid flexible duct for your range hood, regardless of the CFM. Flexible duct is a poor investment because it is: Not durable/sturdy.
How do you duct a bathroom fan?
Quote from the video:
Quote from Youtube video: Out first thing i want to do is remove some of the roof shingles so i can drill a hole all right now i'm going to measure the vent hood. It's five and a half inches.
Can you use flex foil duct for bathroom fan?
Flexible duct is perfectly acceptable for a bathroom fan.
Should bathroom fan duct be insulated?
Regardless of where or how you’re installing your bathroom fan, the accompanying exhaust fan should always be insulated. If you don’t want to deal with condensation, mold, and water damage, insulation is best to avoid it.
Can you use flex duct for bathroom vent?
Can flexible duct and air connect to bathroom exhaust fans? Yes, that’s correct. We recommend that you use insulated flex duct in long vent run applications to help keep the humidity in the duct and to help prevent the pooling of water which can damage the core.
Is flex duct better than hard duct?
Flex ducts are better for existing trunk-and-branch heating and cooling systems. This is because they’re more versatile and flexible. Metal ducts are more rigid due to the nature of steel, making them ideal to build an entire HVAC system.
How long can a bathroom exhaust duct be?
Generally a 4 inch flex duct can carry a fan exhaust for up to 25 ft. Most codes require that.
Is it OK to vent bathroom fan into soffit?
A bathroom fan can be vented through soffit so that the warm air from the bathroom comes out through it and goes outside. However, It is important to keep in mind it can not be vented into the soffit, as this will lead moisture back into the attic.
Can a bathroom fan duct go down?
In general, you can try venting a bath vent fan “down” but the combination of down-direction, elbows, and total run length may mean that it’s ineffective. Take a look at the installation manual for your fan brand and model. The manufacturer will give guidance on the total duct length permitted.
How do you attach a flex duct to an exhaust fan?
Quote from the video:
Quote from Youtube video: Panduit gun and Panduit strap and some tape you'll see why we need the wire cutters here in a minute because I'm gonna name you what not to do as a sheetmetal worker.
How do I know what size flex duct I need?
One simply needs a ruler or measuring tape along with the end of the hose or outlet. Keep in mind that you have to begin the measurements from the interior wall of the circle. The distance to the opposing point of the circle is the measure of the flex duct sizing for the inner diameter.
What is the difference between R6 and R8 flex duct?
R8 ducting uses thicker insulation than R6 ducting. This means that if you were to do air conditioning installation using R8 ducting, you get better insulation than if you are using R6 ducting. When it comes to efficiency of heat insulation R6 ducting is less efficient than R8 ducting.
How far can you run flex duct?
Flexible duct shall be supported at manufacturer’s recommended intervals, but at no greater distance than four feet. Maximum permissible sag is 1/2 inch per foot of spacing between supports.
Is round or square duct better?
With less surface area, no corners, and better airflow, round metal duct work eliminates the chances of dirt and bacteria accumulating in the duct.
How often should flex duct be supported?
every once 4 feet
Supports should be installed at least every once 4 feet. The maximum allowable sag in flexible duct is one-half inch per foot. (Source: Calcs Plus.) Place supports at each connection between flex duct and rigid metal duct.
