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kctimmay 11-10-2012 06:31 PM

Ducting questions for Ventilation System in Man Cave

I'm new to this forum and as you will soon see very new to the idea of HVAC.

I am building a man cave in my basement with the intentions of turning it into my own little cigar club. As you can imagine if i'm not able to vent out the smoke and keep the house from smelling like a fine stoagie my wife will :censored: eh hem. Flip out...

Anyway. I have a drop ceiling already in the basement and my intentions are to retain that. I have a 4 inch space between the top of my drop ceiling hangers and the the floor joists. I am looking at a 1200 cfm fan which will more than adequately meet my cfm needs to meet the target air replacements per hour that a great website online told me i needed..

That said the fan i'm looking at has a 12 inch round inlet. I was wondering if i could run a 3.25 x 10 inch duct with about 2-3 registers for about 20 feet then put a transition to an 8 inch round for about 10- 15 feet then into a 8 to 12 inch round transition which would end at the inline fan itself about 15 feet away. First would this work, and 2 how bad would performance be. I will be creating negative airflow by opening a damper into an existing space.

I hope you all can help me out on this.


Technow 11-10-2012 06:40 PM

They make cigar fans...Its like a bathroom fan..only more powerful. I installed one years ago for a bank president...over his pool table...

kctimmay 11-10-2012 06:55 PM

Do you recall a maker of this?

joecaption 11-10-2012 07:23 PM

Check out the Panisonic web site.
They have a unit that uses one fan and can be hooked up to several lines.

carmon 11-10-2012 07:28 PM

carefull house will go into a negative fast with that much air leaving.... need to replace air if you have an appliance that can spill.... :eek:

Technow 11-10-2012 08:08 PM


Originally Posted by kctimmay (Post 1049154)
Do you recall a maker of this?

I went thru my notes, can't find what it was a very nice fan

joecaption 11-10-2012 08:15 PM

kctimmay 11-10-2012 09:27 PM

Thanks Guys. I've got a good smoke eater/ hepa filtration device with negative ions and even an ozone machine for killing any smell after i leave the room. From what i've found i have to get the smoke out and that is why i'm looking at different ventilation options. I've also found in some research that negative air flow is needed to make sure no smoke makes it back into the rest of the house. There are no other hvac inlets or outlets in this area of the room being sectioned off so I can make sure to keep airflow one way. How much problem do i have with the various transitions?

beenthere 11-11-2012 04:43 AM

You won't get close to 1200CFM with all of those transitions.

Might want to install a small electric baseboard heater. And let it heat the room.

In order to remove that much air, you will also need a way to get that much air into the room. So where is the air intake going to be.

kctimmay 11-11-2012 08:17 AM

My calculated cfm needs are around 650-700 cfm. I figured on some loss from the transistions and what not. i am wanting to get the fan away from the room far enough to help limit noise

I'm afraid the transition from the rectangle to the large circular in addition to the bends will most likely reduce the performance too much an damage the fan.

Poundcake 01-21-2013 02:49 PM

Duct Damper
Don't forget to bring in some positive pressure by running a supply air. You can use a duct damper to fine tune.

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