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Flexible Or Rigid Duct For Bathroom Fan. In un-conditioned space such as an attic where otherwise your fan duct will be exposed to cold attic air in winter use insulated solid metal ducting or insulated flex duct. I will try to use rigid duct wherever possible as the mooth interior has dramatically better flow compared to the flexible ducts corrugated interior. Rigid pipe either metal or PVC wont collect debris inside and block air flow. On the other hand a rigid air duct costs more and is harder to install but its built to last and provides better airflow.
Deflecto Am42 4 Inch Diameter By 2 Feet Semi Rigid Flexible Aluminum Duct Deflecto Http Www Amazon Com Dp B00287ybas Ref C Dryer Duct Exhaust Vent Dryer Hose From pinterest.com
Flexible ductwork uses cheaper materials and therefore is a cheaper option. Im with Calvin on this–you probably have no reason to worry because 16 is well within the designed capability of any bath exhaust fan even with flex duct. What is flexible ducting made out of. 45m from nearest flat outside wall. Someone on another forum is arguing that even this much flex is detrimental to fan performance something on the order of reducing a 80CFM fan down to 20CFM. A hybrid approach to transitioning to flex duct and the benefit of silence.
Expect to pay one.
Avoid using inexpensive flexible duct Flexduct to vent a bathroom fan. However Id like to use rigid ducting since I hear this gives the best air. Every little roughness on the inside of the duct makes it harder to get air to flow so flex duct with ridges on the inside is twice as long as smooth ridged ducting – at least as far as the fan motor is concerned. Here in SoCal we have the Green inspectors that check all the fans for duct sizing dampers and seals. Then each elbow slows things as well. Flexible duct creates way more resistance to air flow.
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They are also used to install ductwork which is not flexible to a certain air supply outlet. Manufacturers then cover the tube in fiberglass insulation. Someone on another forum is arguing that even this much flex is detrimental to fan performance something on the order of reducing a 80CFM fan down to 20CFM. You really dont want to use PVC for a supply air fresh air duct however. Since it is smooth inside it doesnt hurt the.
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Expect to pay one. However its easily kinked or flattened if anything falls onto it. You will want to use a semi rigid metal flexible duct like this - Speedi-Products 4 in. The fan kit is supplied with two 3m lengths of flexible ducting so it looks like its capable of a 4-5m run. Lint catches on all the ridges and creates a fire hazard.
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This rule applies to any type of ductwork. By fabricating bath fan duct runs from rigid metal or PVC plastic youll get the best long-term performance from your fan. Even though flex ducts surface does cause some loss of airflow its probably not much greater than the loss from fitting bends in rigid types of duct especially if you stretch the flex duct tightly to smooth out the inside surface. Smooth metal duct also maximizes vent fan airflow performance. Heavy Duty UL 2158A Flexible Round Aluminum Transition Pipe-EX-MTF 496 - The Home Depot You may need a reducing collar depending on the size outlet.
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Bathroom Vent Fan Ductwork Insulation Insulate the bathroom exhaust vent fan ducts. But flex duct and insulated flex duct are approved by bath vent fan manufacturers are very widely used for fan venting because of its ease of installation and low cost as we describe next. Those punctures cause leaks making the system underperforming. Flexible duct creates way more resistance to air flow. The other solution is to use rigid for the main run and then install about two feet of the flexible duct from the fan to your rigid.
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Those punctures cause leaks making the system underperforming. Here in SoCal we have the Green inspectors that check all the fans for duct sizing dampers and seals. For longer runs a centrifugal type fan should be considered. The downside is that flexible ducting is not as durable as its rigid counterpart and could easily be punctured somewhere along the trace. Im with Calvin on this–you probably have no reason to worry because 16 is well within the designed capability of any bath exhaust fan even with flex duct.
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Then each elbow slows things as well. Same thing in rigid would have required 3 elbows minimum plus a slightly longer length of straight pipe using 290 and 145 or several more elbows to try to form a gentle sweep. Expect to pay one. The rigid duct is made from metal usually galvanized steel or aluminium. However its easily kinked or flattened if anything falls onto it.
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Avoid using inexpensive flexible duct Flexduct to vent a bathroom fan. The loft area above the bathroom is c. Exhaust ducts can be PVC because even if the PVC has a little off-gassing it doesnt matter for exhaust ducts. Here in SoCal we have the Green inspectors that check all the fans for duct sizing dampers and seals. You will want to use a semi rigid metal flexible duct like this - Speedi-Products 4 in.
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They are also used to install ductwork which is not flexible to a certain air supply outlet. See Table M15062 There are other allowances for exhausting distances up. Keep duct runs as short and straight as possible. Same thing in rigid would have required 3 elbows minimum plus a slightly longer length of straight pipe using 290 and 145 or several more elbows to try to form a gentle sweep. Im with Calvin on this–you probably have no reason to worry because 16 is well within the designed capability of any bath exhaust fan even with flex duct.
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That way you can do the duct work ahead of time and then have the flexible end hanging down ready for the installation of the fan. Here in SoCal we have the Green inspectors that check all the fans for duct sizing dampers and seals. Both have their good and bad sides. Manufacturers then cover the tube in fiberglass insulation. Those leaks in the system could lead to power losses and inefficient work of the system.
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Smooth rigid is always best. Avoid using inexpensive flexible duct Flexduct to vent a bathroom fan. However its easily kinked or flattened if anything falls onto it. What is flexible ducting made out of. Whats the difference between rigid and flexible duct.
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Since it is smooth inside it doesnt hurt the. Bathroom Vent Fan Ductwork Insulation Insulate the bathroom exhaust vent fan ducts. Every little roughness on the inside of the duct makes it harder to get air to flow so flex duct with ridges on the inside is twice as long as smooth ridged ducting – at least as far as the fan motor is concerned. Someone on another forum is arguing that even this much flex is detrimental to fan performance something on the order of reducing a 80CFM fan down to 20CFM. For longer runs a centrifugal type fan should be considered.
Source: pinterest.com
Those punctures cause leaks making the system underperforming. Im with Calvin on this–you probably have no reason to worry because 16 is well within the designed capability of any bath exhaust fan even with flex duct. The downside is that flexible ducting is not as durable as its rigid counterpart and could easily be punctured somewhere along the trace. When the drywall is installed it should be even with the housing. 45m from nearest flat outside wall.
Source: pinterest.com
It can crush or tear easily which will impede air flow. Smooth rigid is always best. Here in SoCal we have the Green inspectors that check all the fans for duct sizing dampers and seals. Replacing flexible duct with rigid duct is a new craze now-a-days. Flexible aluminum duct is easier to use than rigid duct and can bend around corners without the need to install extra fittings but some local codes wont allow it so be sure to check.
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Every little roughness on the inside of the duct makes it harder to get air to flow so flex duct with ridges on the inside is twice as long as smooth ridged ducting – at least as far as the fan motor is concerned. That way you can do the duct work ahead of time and then have the flexible end hanging down ready for the installation of the fan. It can crush or tear easily which will impede air flow. Smooth metal duct also maximizes vent fan airflow performance. Keep duct runs as short and straight as possible.
Source: pinterest.com
Expect to pay one. Keep duct runs as short and straight as possible. In some places rigid works better than flexible and vice versa. On the other hand a rigid air duct costs more and is harder to install but its built to last and provides better airflow. I will try to use rigid duct wherever possible as the mooth interior has dramatically better flow compared to the flexible ducts corrugated interior.
Source: pinterest.com
These are low pressure fans and a general rule of thumb for these is to use no more than 15 metres of ducting. I will try to use rigid duct wherever possible as the mooth interior has dramatically better flow compared to the flexible ducts corrugated interior. When the drywall is installed it should be even with the housing. Im just about to fit a centrifugal ceiling 100mm extraction fan in our bathroom and Im trying to choose and source the most appropriate ducting. Lint catches on all the ridges and creates a fire hazard.
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In un-conditioned space such as an attic where otherwise your fan duct will be exposed to cold attic air in winter use insulated solid metal ducting or insulated flex duct. When the pipe needs to change direction the curve should be as smooth as possible so a pair of 45-degree elbows separated by a short length of. Those punctures cause leaks making the system underperforming. On the other hand a rigid air duct costs more and is harder to install but its built to last and provides better airflow. When the drywall is installed it should be even with the housing.
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It can crush or tear easily which will impede air flow. Flexible duct creates way more resistance to air flow. Flexible ductwork uses cheaper materials and therefore is a cheaper option. What is flexible ducting made out of. On the other hand a rigid air duct costs more and is harder to install but its built to last and provides better airflow.
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