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Questions tagged [exhaust]

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1 answer
52 views

Where to run 4" exhaust fan duct?

I'm installing an exhaust fan in my bathroom. I plan to install it somewhere left of the octagon box that you see in the picture, However, there's a 5 3/4" joist right there. I'm not sure if I ...
3 votes
4 answers
12k views

Will a 4", 100CFM bathroom exhaust fan work with 3" exhaust duct?

The bathroom is 112x80x96. The duct to outside will be 3-4' at the longest. This is a 100CFM 25W, 4" fan. The only reason why I want to buy this one is because it has humidity sensor and timer ...
3 votes
3 answers
582 views

Replacing a compact fluorescent bulb in a bathroom exhaust fan with an LED bulb?

I have a bathroom exhaust fan that has a built-in light that is a compact fluorescent bulb. It does not provide sufficient lighting (2400 lumens) and they do not produce a replacement bulb that is ...
0 votes
0 answers
41 views

Bathroom Exhaust - Idea

I am doing a major remodel of my primary bathroom. Instead of the traditional exhaust fans I am thinking of doing something like: Run 3x14" duct in the wall stud cavity from the bathroom ...
0 votes
0 answers
37 views

Bathroom exhaust vent

After my modular house was delivered i had the house sided. For some reason the siding guys went right over my bathroom exhaust exit. I have an idea where it is and the plans show it’s 36 inches off ...
0 votes
1 answer
2k views

Why does my bathroom exhaust fan blow downward?

Replaced exhaust fan and now air blows down into bathroom vs. out the exhaust vent.
0 votes
1 answer
75 views

What is this pipe that is next to our house and HVAC?

We bought a house and it has this next to the HVAC. It looks like a pipe that drains into this cement box that has another pipe inside the cement box going into the ground. There is electricity ...
0 votes
0 answers
28 views

Bathroom fan light combo power source is in ceiling..from 12/2 to 12/3 to gfci to a double pole switch

Remodeling bathroom...removed light installing exhaust fan light combo...power source is already in Ceiling which is 12/2..from the 12/2 it will turn into 12/3 to go down to a gfci outlet and from ...
0 votes
1 answer
266 views

moisture problems in a 104 sq ft bathroom with 110 cfm fan

I have a primary bathroom which was just remodeled. Our GC put in a 110 CFM fan tied to a 4" duct. The exhaust should be taken to an external vent. https://www.lowes.com/pd/Aero-Pure-Low-Profile-...
5 votes
1 answer
5k views

Is a 6" Hole through a 10" Rim Joist ok?

I've got a question about venting through the rim joist. I'm building out my basement workshop and I'm going to install an exhaust fan. The exhaust fan needs an exhaust pipe. The most direct route is ...
0 votes
0 answers
18 views

do they make a a exhauster fan for the 3inch double wall hot water exhaust pipe

this is a older home with large trees. at night times we get exhaust gasses from the hot water heater and I would like to find a inline exhaust fan that I can install.
0 votes
0 answers
559 views

I need a ducted vent hood over my gas range and microwave., t would like to leave my over the range microwave. Can the hood work right this way?

30" LG gas oven; 30" Kitchen Aid microwave. Able to vent the hood through the attic to the outside.
0 votes
0 answers
25 views

Bathroom ceiling exhaust fan wiring

My bathroom exhaust fan/w light has a 4th cable which runs from the fan box to a switch for a strip of 5 lights above the sink. How do I make that connection? In other words, to which black and ...
0 votes
1 answer
159 views

Shower as humidifier -- yea or nay?

During the winter I often do not run the bathroom fan during/after a shower, figuring the house can use the additional humidity. Of course that means waiting for the water vapor to diffuse out of this ...
2 votes
2 answers
2k views

Furnace exhaust vent on roof freezing

My furnace exhaust pipe vents out through the roof. How do I prevent ice accumulation from blocking the exhaust pipe? I have a high efficency furnace. We replaced our gas furnace with a high ...
0 votes
1 answer
74 views

Inducer fan is running but the control board doesn't see it

My Armstrong 51HWC183A-3B furnace is giving me 2 blinks as an error message. According to the manual, the error means: Pressure switch closed while inducer not running The problem that the inducer ...
6 votes
2 answers
2k views

Water heater exhausting inside house

I have this I think standard gap between water heater and chimney. Due to house being colder inside than outside in summer time, I think the pressure difference is not allowing the exhaust to go up ...
-1 votes
1 answer
890 views

Can I use a pair of 2" PVC pipes for a furnace requiring 3" venting?

Can i use two existing 2" PVC pipes from old furnace and tie them together with a Y connection going to the exhaust of a new furnace that requires 3" exhaust? New Furnace is 100,000 btu. 2” ...
0 votes
0 answers
108 views

Bathroom Exhaust Fan venting

I need to install a exhaust fan for a bathroom in Dallas Texas on the first floor. The home is two story home. There are two optionsto exhaust the air out. One is exhaust the air out on the side of ...
0 votes
0 answers
517 views

Outdoor direct vent tankless water heater (low nox) on exterior wall under overhang?

I have an exterior tankless heater that is one of the high-efficiency/low nox type, it has a direct vent (pretty small, actually) just sitting on the top grill. This is mounted outdoors, but is it ...
3 votes
2 answers
709 views

Could clogged exhaust cause codes 13/33 on my furnace, and how do I check and clear?

My Carrier Performance 96 series furnace (similar to the 59TP6 currently shown on Carrier's website, but I don't have the exact model number in front of me) has been showing codes 13 ("Limit Circuit ...
-1 votes
2 answers
12k views

Should I wrap exhaust duct joints of a hot water heater?

I replaced my hot water heater. I used a single flexible 3" metal duct tube to go from the new unit to a an old wye connector metal duct that is near the ceiling in the utility closet. I ...
1 vote
1 answer
743 views

How should I connect my bath fan to the three cables in the ceiling?

I have red-white-black wires coming from my switch and 2 sets of house wires (black-white-grnd). Can someone tell me how to tie these together with a new fan that has two white, one black and one blue ...
0 votes
0 answers
52 views

How can I install my dryer exhaust - Should I contact the builder?

I am trying to install my new LG dryer exhaust in a new build home and the part attached to the wall just fell off. Should I contact the builder? I have done this before and it was not as complicated. ...
1 vote
1 answer
232 views

Hvac damper types - which one is quietest

I'm trying to minimize noise in a lampwork shop exhaust system. The system consists of a 1/2 hp squirrel cage type blower connected to the shop space with 8" round ducting. I am installing a ...
0 votes
0 answers
644 views

Bathroom 3 in 1 switches in seperate locations

Intent: To have heater/exhaust/light unit installed with the light switch separate from the heater/exhaust. Why? I have a light/exhaust on one switch (next to door), but would like a 3 in 1. The ...
0 votes
0 answers
2k views

Is 20' of 2" PVC with 2 45 degree elbows too restrictive for a 92% furnace?

I have a Goodman furnace, 92% efficient, GKS91155DXAF. The exhaust vent flue was previously 2 inch PVC with one 45 degree elbow about 6 feet long overall, and it was routed directly into a piece of 6&...
1 vote
3 answers
1k views

Size of insulated flex hose needed to install for bathroom exhaust?

What size of insulated flex hose do I need to install for bathroom exhaust. Fan is 110cm. Length of hose in attic is approx 15-20 ft, going just about straight to the exit site. Bathroom size is ...
2 votes
2 answers
1k views

Combine two bathroom exhaust vents?

I have a tiny bathroom for the toilet, perhaps 83 cu ft adjacent to the master bathroom for the shower and tub, perhaps 1266 cu ft. Currently only the toilet has a vent with a fan. It’s being removed ...
4 votes
3 answers
3k views

How can I prevent cold air from dropping down my bath fan duct?

In my new home, on the second floor, the bathroom fans goes outside and under the roof, so the output is upside down. They installed the type of vent with a flap that, normally with gravity and ...
0 votes
1 answer
566 views

Outside cap for exhaust fan

What is the best cap to use for a thru-wall bathroom exhaust fan install? The ducting is 4" smooth aluminum. Winters here are brutal. I'm concerned about wind sucking the cap flaps open, letting ...
0 votes
0 answers
2k views

Venting Dryer to Outside Through Foundation Wall OR Vent?

I'm relocating and replacing the ducting to vent my electric dryer that is located in the middle of my home. I'm using 4" galvanized duct, I've installed a Dryer Box on the back (2x6) wall of my ...
0 votes
0 answers
465 views

Is it a good idea to blow hot air through drywall?

I have a small room with no windows and I want to cool it down. A friend of mine suggested me to get a portable AC, create a hole in the wall (drywall) and put the exhaust hose through the wall. This ...
-2 votes
2 answers
2k views

Gas Vent Pipe - Outside Placement

I Recently adjusted the exterior furnace gas vent pipe as per the picture below. The old placement ended where the first elbow (up/left looking at the pic) is currently. However given that my 2 year ...
-1 votes
1 answer
406 views

How to remove this ancient exhaust fan?

It seems to be held in by those metal strips that I can't budge.The wood that it's up against is thin- only about 1/4 inch. And the metal part starts/stops at the visible wood and extends beyond sight ...
0 votes
0 answers
43 views

Bathroom exhaust fan and light

I just got bathroom fan and light. Only my light is working. Is there any way I can splice the fan wire with the light. I only have two wires on my switch and I don’t want to run a new wire.
2 votes
0 answers
164 views

Thru Wall Exhaust Fan in bathroom on window header

I am trying to add a thru-wall fan in my 1st floor bathroom. The bathroom is 59 inches wall to wall. There is a window of 41 inches. I want to add the fan above the window, but i found a window header ...
2 votes
1 answer
10k views

Venting Two Bathroom Fans to Single Roof Vent

Can I have two different exhaust fans in the same bathroom on the same switch. ? (I.E. on/off at the same time, both ducting to a y-adapter attached to a single roof vent opening). One fan uses 4&...
-1 votes
2 answers
74 views

What size of exhaust fan do I need, how many air changes, CFM?

I need to provide an exhaust fan equivalent to ventilation by a 4 square feet of window. What size of exhaust fan do I need, how many air changes, CFM? My client wants to replace a bedroom window with ...
1 vote
0 answers
53 views

can a bathroom or kitchen exhaust airt through a vent placed in the outter edge of the soffit and pointing down and out

Can a bathroom or kitchen range vent out through a vent-unit placed on the outter-edge of a soffit if it is pointing down and away from the house?
1 vote
1 answer
1k views

Vibrating PVC exhaust pipe from high efficiency furnace

We have a two year old house that has this heating season developed a vibration in the exhaust pipe that can be heard on the first floor of the house. It seems to have decreased as the season has ...
1 vote
0 answers
1k views

Exhaust vents exiting outside next to each other

Is there any code that requires exhaust vents specifically for bathroom, Kitchen hood, and clothes dryer to terminate ‘x’ distance apart? For instance, placing these three exhaust exits on the same ...
2 votes
1 answer
2k views

Bathroom fan too loud

I recently installed a new bathroom fan in our master bath in hopes for a much quieter environment. I installed a NuTone Model # AERN110 (110 CFM, 1.0 sone). I've never had an ultra quiet exhaust ...
0 votes
0 answers
30 views

wiring a bathroom exhaust fan to a continuous circuit [duplicate]

We are adding a bathroom fan to our bathroom that never had one. We found power from the attic that we may be able to use. This power joins the hallway ceiling light to the hallway switch. We would ...
1 vote
1 answer
2k views

OK to cut double top plate to clear exhaust duct?

I am installing a exhaust fan duct in my 1st floor kitchen. I had planned to go under 2nd story joists/above kitchen cabinet, thru the wall. Unfortunately, the desired location on the wall would split-...
0 votes
1 answer
2k views

Exhaust Fan in small half bathroom on first floor

Hi, I would like to add an exhaust fan in my small half bathroom on the first floor (it’s a 2 floor semi-attached home). The bathroom becomes very humid and takes a few minutes to eliminate odors. I’...
0 votes
0 answers
43 views

Using existing hot water vent for extraction

I have a room in the basement with equipment (computers) that gets really hot. There is an ac vent but the thermostat is nowhere near the room. Also in an alcove is the hot water heater behind a ...
1 vote
1 answer
199 views

Cutting out existing steel duct in bathroom vent

I'm enlarging my bathroom vent. It's a brick wall and currently has a steel duct. I've chipped away brick but the lip of the existing steel duct is still there. I need to remove around 2 inches of it. ...
0 votes
1 answer
108 views

Dryer exhaust pipe

M1502.4.1 Material and size. Exhaust ducts shall have a smooth interior finish and be constructed of metal having a minimum thickness of 0.0157 inches (0.3950 mm) (No. 28gage). (a) can I use metal ...
0 votes
1 answer
124 views

Exhaust Fan Runs With No Power at All!

How can my furnace exhaust fan run with the power off, the thermostat off, and the breaker off?!