Tagged: vent

Q&A: U Bend, B Vent, Code Compliant?

Photo credit: TheDrPepper

Q: Only seen a couple of these around Chicago. Is this a code compliant exhaust cap? Was told it was because “rain kept blowing into the cap and dripping down the vent pipes.”

It is for natural gas furnaces (second floor) that connects to an upper units venting (3rd floor) and then out.

– TheDrPepper

A: Assuming it’s venting a category 1 appliance, no. At no point should a natural draft vent system slope downward. If the cap is leaking, get one that doesn’t. NFPA 54 section 12.7.2 -Gas Vent Termination – Tony3696

NFPA 54 section 12.7.2 -Gas Vent Termination
Page 229 has a pic of what is acceptable. It does not mention a U bend.  – 33445delray

17 Oct

What is this light in my bathroom vent? Humidity sensor?

xfkolqyraredditusername2 asks: What is this light in my bathroom vent? Humidity sensor?

Answer (from Iforgatmyusername): It’s the humidity sensor. No it’s not a camera.

Humidity Sensor Operations for Hampton Bay 80 CFM No Cut Ceiling Humidity Sensing Bath Fan

1 Humidity sensing mode. Move the wall on/off switch to the “ON” position. The LED indicator light in the fan is BLUE. The fan will automatically go on when the humidity level in the room goes above 60%.

2 Full speed mode. Cycle the wall on/off switch to the “OFF” position, then back to the “ON” position. The LED indicator light in the fan is AMBER.

3 Fan off. Move the wall on/off switch to the “OFF” position

15 Nov

Best way of covering a vent occasionally?

ventsamwalker5 writes:

“Hi,

I am trying to figure out how to cover a vent in my house so that when I am using the room as a darkroom (with chemicals) it will not feed the chemical odors into the rest of my house. It is a large vent which is on the wall.

I would want to cover it well, but I was hoping it would be a quick and easy way to cover it every so often, without having to tape plastic over it all the time.

thanks!”

Answer: If it is a return grill then do not cover it if the system is running unless you have multiple return grills in your home. The grill is most likely metal so take your plastic sheet you are taping on and attach magnetic strips to it. you can pick up low cost rolls of magnets at most Dollar Stores and hardware stores.
James Bowman
National Technical Manager, HVACR

24 Aug