Question about Fantech Fan FG8XL

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Size of vent pipe

Plan to put in remote range hood fan using Fantech FG8XL @ 512 CFM . Have to run about 28 ft of 8 inch flexible ducting. Flex duct will bend 45 degrees twice. How would the air flow be affected? Would useing 10 inch be significantly better?

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You will be fine with 2 bends in an 8 inch pipe. If you bend it more than 3 times though you will loose fan force. If you up to a 10 inch duct you will not have good fan force because the space is bigger.

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Posted on Feb 25, 2009

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Keep getting warning "check exhaust" on a new gas dryer. All exhaust is clear. What's going on?


The CHECK VENT duct blockage sensing system detects and alerts you to blockages in the duct work that reduce exhaust flow from the dryer. This light does not indicate any problems with your dryer. If this light blinks, it indicates that your home's exhaust system/duct work has a serious restriction

Every time the dryer is turned on, the CHECK FILTER LIGHT WILL BLINK, as a reminder to make sure the filter is clean. Always make sure the lint filter is clean before starting a new load; a clogged lint filter will increase drying times.

The Kenmore Elite dryer has a sensor that detects poor exhaust venting, and when it does, a light flashes on the control panel. This warning light does not include a mechanism to stop gas flow, but if it is allowed to flash for an extended period, poor venting may cause the dryer to overheat. As a result, a fuse might blow and disable the gas valve or ignitor. You can prevent this by diagnosing the reason for the flashing indicator light as soon as possible.

In many cases, LINT has built up somewhere in the exhaust pipes.

Check under the lint filter. Pull it out,look inside the slot it fits in, and clear all lint from this area.

Is it possible you have used the WRONG VENT MATERIAL?
Check your vent to make sure it is 4 inch rigid or semi-rigid metal ducting. If your venting is plastic or flexible foil, replace it before using the dryer.

Check your vent hood outside. You may have a restricted or damaged vent hood. It must be clean and free of lint buildup. Check the damper and make sure it opens fully and easily and is free of lint.

I know you said you have no elbows, but I have posted the pipe run lengths with and without elbows. Keep in mind this is with 4 inch rigid or semi rigid metal ducting.

Measure the length of your exhaust system and count the elbows. Use the chart below to see if your duct is too long. If it is too long, have the duct routed to another location that is within the venting guidelines.

0~90 degree elbows=65 ft of 4 inch rigid metal duct.
1~90 degree elbow=55 ft of 4 inch rigid metal duct.
2~90 degree elbows=47 ft """"""""
3~90 degree elbows=36 ft """"""""
4~90 degree elbows=28 ft """"""""

You should always use duct tape or metal tape on all joints, NEVER USE SCREWS, as screws capture lint inside the pipe.

One more note. Lots of people overlook the fact that fabric softeners can build up on the lint filter over time. This buildup can restrict the airflow through the filter reducing dryer efficiency and lengthening drying times. After removing lint, if the filter looks dark or dirty when held up to the light, follow these steps to clean:

Use hot soapy water and a stiff brush to clean
the filter.
Make sure the filter is completely dry before
reinstalling it and using the dryer.
NEVER operate the dryer with a wet lint filter.

Oct 29, 2014 | Kenmore Dryers

Tip

Dryer Ducting Installation Advice


Here's some useful guidance for installing dryer ducting. Improperly installed ducting can cause the following:

GAS DRYERS - Rapid burn cycling and improper drying results.
ELECTRIC DRYERS - Premature Heating Element failures.

IMPORTANT! NEVER terminate ducting in a chimney, under an enclosed crawl space or attic, and never common a dryer duct with a kitchen exhaust.

The total length of ducting and number of turns should be kept to a minimum. Semi-rigid metal type ducting is strongly recommended as it is more durable and resists collapsing.

If connecting sections of ducting, all joints should be tight to avoid leaks. The male end of each section must point AWAY from the dryer to prevent lint from accumulating at each junction. Ductwork should NOT be assembled with screws or fasteners that extend INTO the duct as this also will create points where lint will become snagged and accumulate. Wrap overlapping sections of ducting with duct tape.

A screen should NEVER be installed over the exhaust duct termination. The preferred termination is a dampered wall cap having a 4 inch opening. It must be installed a minimum of 12 inches above the ground.

Maximum Length of Metal Duct:

# of 90 degree elbows:

4" Semi-Rigid 4" Flexible
0 - 58 ft 28 ft
1 - 48 ft 23 ft
2 - 38 ft 19 ft
3 - 29 ft 17 ft
4 - 21 ft 15 ft

NOTE: It is recommended that you inspect your dryer ducting periodically to ensure you have no lint build up. Excessive lint can present a fire hazard.

on Dec 04, 2009 | Dryers

1 Answer

Dryer vent duct


The vent pipe codes are based on the fact that the blower in a typical gas dryer can only 'push' a certain volume of air through a certain sized duct for a certain number of feet. Reduced volume of airflow means higher temperatures thus higher risk of fire.
First option ... is your dryer anywhere near a side wall, which would allow you to shorten the total length of duct required to reach the outside to something less than the 14 ft code limit ?
Second option ... upsize the standard 4" dryer exhaust duct to 6" to compensate for the 30ft length
Either way, in the absence of an external forced draft booster fan ( a.k.a. 'power vent' fan ) you should be using metal exhaust duct not plastic.

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1 Answer

Extraction ducting too long!!


To get the correct dimension, you could make up a template out of thin carboard to do your testing before you cut the metallic duct.

You will need to match the area of square inches of the duct, no matter the shape. If it's round the formula is (pi (3.1416) x radius squared). If it's square or rectangular, it's L x W in inches. Your local home improvement store (if there is one) should stock various adapters and metallic round duct.

Note that since this is being used in a kitchen, the duct should be metal and it should vent to the outside unless it is a recycle hood.

Let us know if that helps...if not we'll try again!

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Smell of neighbours cooking comes through hood fan! HELP!


It appears to me that each hood has a fan discharging air and odours into a common duct.
The only solution to me is to have a main exhaust fan at the very end of the duct continually sucking the air out of the duct.This way it will not allow the individual hood fans to pressurise the main duct,forcing the air to esape through the path of least resistance,which happens to be the neighboars hood.

It may be that such a fan is existent but switched off due to malfunction,or switched off for running costs reasons.

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Moisture on bathroom exhause vent


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LG DLG5988 installation Vent size


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This complaint is most often caused by the dryer's vent being blocked with lint. Dryers need to be properly vented, otherwise the moisture in the air can't be properly carried away. Vents that go out the roof are particularly problematic-- the dryer may take far too long to dry clothes and the vent pipe may even drip water that can't be exhausted. Minimum size for a dryer's roof vent is 4 inches. If your dryer has chronically poor drying, if possible, have the vent moved to where it exits a house wall near the dryer. The vent should be made of 4-inch aluminum rigid duct and elbows or, where absolutely necessary, flexible metal (but not flexible thin foil). Do not use flexible plastic duct-- it restricts air flow and is combustible. The dryer should vent outside--never into a crawl space, wall, ceiling chimney, or other type of flue. The bottom of the exhaust hood should be located at least 12 inches above the ground. Here is what to do: 1) Check the lint trap and clean it. 2) Be sure the dryer isn't pushed so close to the wall that it pinches off the airflow through the vent's air duct hose. 3) Check the point where the air duct vents away from the house. Be sure plants, birds, or anything else hasn't blocked it. If the duct vents out the roof, it could easily be blocked with lint. 4) Disconnect the air duct hose from the back of the gas dryer and clean out built-up lint. Note: For safety, first turn off the gas to the dryer, then unplug the dryer; this means you will have to re-light the pilot light later if the dryer has one (read your owner?s manual for proper re-lighting techniques). 5) If necessary, clean out the ductwork from the dryer to the exterior wall where it vents; this may involve disconnecting sections. One trick that sometimes makes this job easier (but only if the dryer duct is fastened firmly at all connection points) is to blow lint and debris through the duct and out the exterior wall vent, using an electric leaf blower.

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