Diesel exhaust removal in garage.

[Big Bear]

I am finishing a 36x56 ft pole barn for a workshop/garage for toys, and a home for the coach. I plan on putting in a system to remove or keep to a minimum the exhaust created during startup while waiting for the air pressure to build. My plan is to use a piece of flex aluminum vent pipe 16 ft by 6 in. leading to the side wall of barn with a flapper type vent. I have found 2 fans that will aid the flow. One is 250 cfm, & will fit into the pipe, the other is 500 cfm. but 8"� dia. & will have to be adapted to the pipe, not a big deal. THE QUESTION IS, will the small fan be large enough while the engine is running at fast idle, or will I need the 500 cfm, OR, make a suction box with a larger fan at the sidewall vent location.

Vern in Duvall, Wa..

2004 Vectra 40 AD Cummins 350 W/Banks power package
2004 PT Cruiser, GT, Turbo, w/5 speed
Blue Ox Avanta 11 & Blue Ox tow plate W/Brake Buddy
Good Sam, long time Thousand Trails, & considering FMCA

[Big Bear]

I am finishing a 36x56 ft pole barn for a workshop/garage for toys, and a home for the coach. I plan on putting in a system to remove or keep to a minimum the exhaust created during startup while waiting for the air pressure to build. My plan is to use a piece of flex aluminum vent pipe 16 ft by 6 in. leading to the side wall of barn with a flapper type vent. I have found 2 fans that will aid the flow. One is 250 cfm, & will fit into the pipe, the other is 500 cfm. but 8"� dia. & will have to be adapted to the pipe, not a big deal. THE QUESTION IS, will the small fan be large enough while the engine is running at fast idle, or will I need the 500 cfm, OR, make a suction box with a larger fan at the sidewall vent location.

Vern in Duvall, Wa..

2004 Vectra 40 AD Cummins 350 W/Banks power package
2004 PT Cruiser, GT, Turbo, w/5 speed
Blue Ox Avanta 11 & Blue Ox tow plate W/Brake Buddy
Good Sam, long time Thousand Trails, & considering FMCA