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Birds in flu

How do I keep birds out of the combustion air intake pipe of a 90+ direct vent thru wall pvc pipe system?

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Buy a small piece of chicken wire.
One additional piece of PVC pipe, and a coupling.

Cut the chicken wire the exact size of the outside diamiter of the pipe, place it on the end of the pipe and install the coupling over it.

The chicken wire "screen" will be help in place by the pipe wall, the internal ring on the coupling, and the PVC glue. Cut the pipe to the length you need and install it on the intake pipe outside the wall.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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Does my furnace require outside air?


I'm surprised the building inspector allowed the condensing furnace you described draw combustion air from the garage !! I'm not familiar with any manufacturer that recommends that as normal practice. Virtuall ALL two pipe condensing furnaces require both pvc pipes to be terminated OUTSIDE the structure with specific heights and distances apart. There is also a limit to the length of both the flu and the combustion air piping and each 90 degree pvc elbow adds the resistance equivalant of roughly 10' of straight pipe. If re-routing is required, you have to bear in mind the direction of 'fall' in the piping usually goes back towards the furnace and remember two 45's may give you a greater variance of change in the piping and still be equal to the equivalant of one 90.

Personally, I would never suggest terminating the fresh air (combustion air) intake between floors of a structure.

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1 Answer

I have a intertherm m1m furnace and the red light blinks 2 times indicating the pressure switch is open how do I correct this problem


The pressure switch is a pressure sensing device to ensure the system is operating within the parameters for which it was designed. The pressure switch on the positive pressure side of the combustion air fan when tripped indicates a flu blockage which will limit the amount of flu gasses passing through the heat exchanger. I would suggest checking the flu for a blockage and if there is a second pipe (combustion air), you should check it also as with either blocked, the proper operation of the pressure switches is in jeopardy.

You cannot bypass the pressure switches because the algorithym in the control module will see that the pressure switch is in the wrong position at the moment a call for heat was initiated.

If there are no flue blockages apparent but you find that there is no screen on the end of the flu pipe or pipes, you may still have a blockage in the form of a dead bird. They like to roost inside the openings of the pvc pipes for warmth, then die of carbon monoxide poisoning and block the pipe. Sometimes they even make their way the full horizontal length and die at an elbow and fall directly on top of the flu opening on top of the furnace. I have had to make numerous cuts to locate blockages before.

Dec 31, 2014 | Intertherm Heating & Cooling

1 Answer

How do you get rid of an airlock in the bathroom drain pipe? There is no specific product....just pvc drain pipes.


Your vent may be clogged. Sometimes birds try to nest inside the pipe up on the roof. It must be snaked.

May 23, 2014 | Home

1 Answer

I have a American Standard furnace Freedom 80 Mod# AUD080C936H3 and am looking for a manal or can you tell me how the exauhst is done. Can I use PVC


Hello, The only time pvc is allowed is if the Furnace is 90% or greater in effiecency, the combustion gases are cooler due to the fact that two heat exvhangers are used. One pipe will be you air intake and the other the exhaust and they can be routed through the roof or sidewall. If the Furnace is 80% then you must use double wall vent pipe and have it connected to either a liner in a chimney or routed through a roof but pvc can not be used.

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1 Answer

I have 2goodmanGKS9 gas furnaces(propane) installed on 27 Dec 2009. Both units are working. One is in the basement adjacent to the rear outside wall. Lower unit heats about 1200 square feet. Lower...


well lets start with the 2" pvc pipe. that is a combustion air intake it does not put air into the room, i hope. this is a 90% furnace and they should have installed it that way. there should be 2 pipes to the outside the other is combustion gases. the dust problem maybe caused by the air return pulling the air to that room. the bedroom normaly does not get the trafic that the rest of the condo does.so it would not have as much dust.

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1 Answer

Colman mobile home gas furnace to use in my garage/shop


generally speaking a sealed combustion system is inherently more safe than a system that draws it's combustion air from it's ambient location. however, it cannot be considered 100% safe in a potentially hazardous location. The actual system that would be used in a "code compliant" installation would be a 100% outside air unit.
That being said, you can install this in a garage, the vent that you are referring to (if it is a standard mobile home system) is generally directly above the unit and usually no longer than about five feet. It also requires a listed and labeled termination "cap" If you install 90 degree angles or extend the vent too far you will have issues with condensation in the piping that will cause the pipe/ heat exchanger to fail prematurely.
If the system is a 90+ efficeint unit then the PVC venting is generally allowed to be about 30 feet long, with a 1/4 inch per foot pitch back to the unit for condensation, also the general mfg. instructions allow either 2- 90 degree or 4 45 degree fittings in the line. hope this helps

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1 Answer

Takes a very long time to dry a load


95% chance the vent is clogged.
When te vent and /or pipe is clogged, the moist air has nowhere to go and it will take longer to dry. Clogged vents/pipes are also a fire hazzard.

Find where the vent exits the home, and look inside. They often get clogged with lint, birds nests etc. There should be a flap or grid to prevent entry of birds and other critters, but they often break off.

Cloggs can also occur at the dryer where the vent exits the dryer.

IF THE VENT PIPE IS PLASTIC you should replace it with a metal vent. Flexible is OK in most areas, but it should be metal.

The plastic pipes have been deemed a fire hazard in many areas.
Check your local codes to be sure of your requirements

Dec 04, 2008 | Dryers

1 Answer

Rudd exhuast and air intake lines


You need to make sureyou are at least 12" above ground with your termination if you live where you get accumulating snow levels. Next, your exhaust needs to be separated from your intake via a "goose neck"(straight pipe out of your house with 90 degree elbow pointed up then attach a 10" piece of pipe with a 90 degree elbow pointed out away from your house. The reason you want to keep them separated is that your intake will **** exhausted air into combustion chamber causing burner lift etc. due to no oxygen to properly burn. I usually put a 45 degree on intake so it is not so inviting to birds etc. Good Luck

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1 Answer

Kenmore 110.72512101 gas dryer


Are you getting little or no lint on the lint screen? Are the clothes coming out nearly as wet as they went in, but feel warm? If so, you probably have a blockage somewhere in the vent/duct. Don't just check the back of the dryer, but also check the duct thru the wall and the point where it exits the house (exterior wall or roof). Many times birds will nest in the exterior vents or if they have a screen to keep the birds out it may become clogged with lint. If you have a window nearby try drying a load with the vent hose disconnected from the wall and hang it out the window (you COULD vent it into the house, but you may end up with lint everywhere and a lot of moisture in your house).

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2 Answers

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You have a crack in your heat exchanger and it is sucking in products of combustion. Replace the heater. OR there is a blockage in the intake or exhaust vent. GET IT FIXED OR REPLACED!

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