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Cigar Exhaust

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PJMav

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Jan 13, 2025
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My basement office is about 120 sq ft, (about 910 cubic ft). I am using a Vevor 4" inline fan for exhaust, (200 CFM). This calculates to turning the air in the room roughly 13 times an hour. It vents directly outside through 4" PVC pipe. For input air, I do not have any specific set up. There is a drop ceiling in the room which allows for some air to be drawn in. Also, the gap at the bottom of the door is about 5/8" that draws ait when fan is on. I am not entirely convinced that is enough. I have been thinking of putting a vent in the wall to the basement to have additional air drawn in when the fan is on. Anyone have any suggestions/thoughts if this may help exhaust the smoke better? I also use a Winix C545 air purifier in the room. The exhaust vent is in the exact middle of the room, (see pic for vent used)

Appreciate your ideas........
 

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If you are having return air issues, there are a few things you can do.
I think the simplest would be to add a louvered vent above the door to the room, usually there is open space between the door studs.
I would use a louvered vent that only allows air into the room to keep the residual odor from passing back into the rest of the house.

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PJMav said:
My basement office is about 120 sq ft, (about 910 cubic ft). I am using a Vevor 4" inline fan for exhaust, (200 CFM). This calculates to turning the air in the room roughly 13 times an hour. It vents directly outside through 4" PVC pipe. For input air, I do not have any specific set up. There is a drop ceiling in the room which allows for some air to be drawn in. Also, the gap at the bottom of the door is about 5/8" that draws ait when fan is on. I am not entirely convinced that is enough. I have been thinking of putting a vent in the wall to the basement to have additional air drawn in when the fan is on. Anyone have any suggestions/thoughts if this may help exhaust the smoke better? I also use a Winix C545 air purifier in the room. The exhaust vent is in the exact middle of the room, (see pic for vent used)

Appreciate your ideas........
Click to expand...
Also, please head over to the introduction thread and let us know who you are!
 
I want to do this with my garage
 
Have you confirmed that you have negative air pressure in the room? Otherwise, the exhaust fan isn't going to be very effective. Get the largest CFM fan you can. Vevor is good.
 
Close everything up.

I assume the exhaust ducting is attached to a sealed outlet, and not just hanging out of an open window? If sealed, turn on fan to max, and hold a lit cigar at the bottom of your door. Obviously be careful not to burn anything... Best if you can hold it on the other side of the door, near the gap. Where does the smoke go? Does it float between the gap, or does it all go inside the room? You should actually see a pretty good "pull" of smoke if you have negative air pressure.

If the negative airflow is weak, ensure you have sealed everything up properly. Get a larger, more powerful exhaust fan. Are you using a 4" or 6" fan? For even more negative pressure, install two fans with two exhausts spaced apart accordingly. There is no other way to get rid of the cigar smoke other than to exhaust it as fast as you can. Also, maybe you're pulling in stale air from where you're exhausting it. Ensure the air coming in is 100% clean (it most likely is). You can also attach carbon filters at the end of the exhaust line, and this will greatly reduce, if not eliminate any cigar smoke aroma that is sent out of the room.

The casino's in Las Vegas have some of the best air filtration around. I heard they test their negative airflow by letting go of a light feather and it's supposed to float towards the ceiling.
 
I just saw you said 4". You could try increasing the overall power (strong cfm and 6" ducting). While again making sure everything is sealed properly. The WinIx purifier is really good as well.
 
Rod said:
I just saw you said 4". You could try increasing the overall power (strong cfm and 6" ducting). While again making sure everything is sealed properly. The WinIx purifier is really good as well.
Click to expand...

Looks like he has a dropped ceiling and tiles that go with it. Those will be a PIA to seal, IMO. They do make HVAC aluminum tape, just not sure which side would be the best to seal up the ceiling.
 
Rod said:
Close everything up.

I assume the exhaust ducting is attached to a sealed outlet, and not just hanging out of an open window? If sealed, turn on fan to max, and hold a lit cigar at the bottom of your door. Obviously be careful not to burn anything... Best if you can hold it on the other side of the door, near the gap. Where does the smoke go? Does it float between the gap, or does it all go inside the room? You should actually see a pretty good "pull" of smoke if you have negative air pressure.

If the negative airflow is weak, ensure you have sealed everything up properly. Get a larger, more powerful exhaust fan. Are you using a 4" or 6" fan? For even more negative pressure, install two fans with two exhausts spaced apart accordingly. There is no other way to get rid of the cigar smoke other than to exhaust it as fast as you can. Also, maybe you're pulling in stale air from where you're exhausting it. Ensure the air coming in is 100% clean (it most likely is). You can also attach carbon filters at the end of the exhaust line, and this will greatly reduce, if not eliminate any cigar smoke aroma that is sent out of the room.

The casino's in Las Vegas have some of the best air filtration around. I heard they test their negative airflow by letting go of a light feather and it's supposed to float towards the ceiling.
Click to expand...
Thanks for the time you put into this. I'll run some tests!!
 
bfreebern said:
Looks like he has a dropped ceiling and tiles that go with it. Those will be a PIA to seal, IMO. They do make HVAC aluminum tape, just not sure which side would be the best to seal up the ceiling.
Click to expand...

Good point. If smoke gets trapped up there, it'll probably linger around for awhile. Perhaps install a lower cfm fan above the tiles too. A low cfm to ensure you don't start sucking too much smoke above the ceiling.
 
bfreebern said:
Looks like he has a dropped ceiling and tiles that go with it. Those will be a PIA to seal, IMO. They do make HVAC aluminum tape, just not sure which side would be the best to seal up the ceiling.
Click to expand...
Good catch, that is going to make a huge difference, drop ceilings are a PITA
 
Rod said:
Have you confirmed that you have negative air pressure in the room? Otherwise, the exhaust fan isn't going to be very effective. Get the largest CFM fan you can. Vevor is good.
Click to expand...
I just tested it. Held my cigar three inches from bottom of door, outside the room, and all smoke was easily being drawn into room, none escaping into the basement.
 
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PJMav said:
I just tested it. Held my cigar three inches from bottom of door, outside the room, and all smoke was easily being drawn into room, none escaping into the basement.
Click to expand...

That’s good news! Now you have to exhaust it out of that room as effectively as possible.
 
You’ve been a great help. Thank you very much.

Maybe I’m expecting more than I can get out of the setup and should be happy. Nothing is escaping to the living area which would completely curtail my habit!!
 
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