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Exhaust system for diesel fired forge furnaces

ADAG (Mechanical) (OP)
6 Dec 07 14:44
Hello,   I need to design an exhaust system  for a  forge shop,  the forge  has 3 small diesel fired forge furnaces.  I am not sure what criteria to use  to estimate the required CFMs for each furnace.  My only reference  is that presented  on the ACGIH  INdustrial Ventilation Manual for Melting  pots and furnaces,  they recommend 100-200 cfm per ft2 of opening, I would thing the requirements for a  forge  furnace  should be lower. The opening  of  my ovens  are  quite small (about 28" long per 8" high) resulting, using the above mentioned rates, around 250 CFM (seems a bit low)per oven plus volume for combustion products.  

Sounds right? anybody out there has  worked  in a  similar application?

 
MikeHalloran (Mechanical)
19 Dec 07 18:37
I haven't worked with this stuff much, but 250 CFM sounds about right for draft through the furnace.

I'd imagine you'd want some other ventilation around the furnace mouth, to draw off smoke from items to be forged.  That, presumably, would have a much larger opening, and require more exhaust volume.

Mike Halloran
Pembroke Pines, FL, USA

dvd (Mechanical)
19 Dec 07 19:54
Seems like the exhaust rate should depend on the amount of fuel burned per unit time, the excess air ratio, the pressure differential between inside the forge and outside, and the opening size.

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