Looking for in-line duct fan

I use a vent stack that is about 4' tall (a 90* EL and 2x2' sections). Unless I am running at high temp, I can put my hand on the stack at about 18" above the 90* EL with no problem. I think you would be fine if you placed the duct fan higher in the vent stack. At least that is my $.02.....

That has been my best solution so far is to mount it as far away from the smoker as possible.

I am in the design phase of a new trailer.
Need to mount a pair of FEC's in an enclosed area seperate from the kitchen and living area.
The exhaust duct will be about 4-5 feet with a rain cap.
I have run 4 foot vertical pipe in the past with no problems.

Any help on this duct fan thing??
Think I will need one?
Would it help exhaust smoke when opening the door? Easy to switch and control speed.

Thanks in Advance

TIM

ps--found many duct fans on line. Very reasonably priced.

I'm not familiar with the FEC operation, but I don't see that an inline exhaust fan will adequately compensate for the smoke that is released when opening the door. I would think the only effectlive way to adequately exhaust smoke when opening the smoker door would be via exhaust fans located over the smoker and perhaps within an exhaust hood configuration. To some extent it would depend on health inpsector requirements in your area for enclosed units located in mobile food service vehicles. Of course if you're not concerned about any health inpspectors an oversized exhaust fan mounted in a manner to supplement the exhaust might provide some relief, wherein the fan operation is initiated upon opening the door.

I may have to put an exhaust fan in, just doing some experimenting. But I would think if you turned the fan on for 10 seconds or so before you opened the door it would clear the smoke but we'll see