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BillA · 02-14-2006, 07:17 AM

yea, if the fan is operated at very low back-pressure it will burn up the motor - easily

that speed controller is for ceiling fans, will not work
get a 1 to 3 phase speed controller, $150 + and use the 3 phase motor with a blast gate

spent yesterday looking for a copy of AMCA 210-99, $90
tried an interlibrary loan but from OK is unlikely, probably a ref copy

the diffusers are screens with different gage wire and spacing
the 500 CFM unit from fantester uses a 16" tube, ~ok for 2 120mm fans in parallel; w/o the blower or gate $6900

a 32" dia concrete form tube is $116.80 for a 12' length
a 34" spiral formed steel duct 7' long is $129.00
either would need bulkheads, etc., etc., etc
am now thinking to go for 20 to 24" dia, looking for a surplus aluminum pipe now - easier to weld

awaiting a quote on the nozzles, not yet sourced the screens

02-14-2006, 07:17 AM	#56
BillA CoolingWorks Tech Guy Formerly "Unregistered" Join Date: Dec 2000 Location: Posts: 2,371.493,106 Posts: 4,440	Re: Wind Tunnel Construction yea, if the fan is operated at very low back-pressure it will burn up the motor - easily that speed controller is for ceiling fans, will not work get a 1 to 3 phase speed controller, $150 + and use the 3 phase motor with a blast gate spent yesterday looking for a copy of AMCA 210-99, $90 tried an interlibrary loan but from OK is unlikely, probably a ref copy the diffusers are screens with different gage wire and spacing the 500 CFM unit from fantester uses a 16" tube, ~ok for 2 120mm fans in parallel; w/o the blower or gate $6900 a 32" dia concrete form tube is $116.80 for a 12' length a 34" spiral formed steel duct 7' long is $129.00 either would need bulkheads, etc., etc., etc am now thinking to go for 20 to 24" dia, looking for a surplus aluminum pipe now - easier to weld awaiting a quote on the nozzles, not yet sourced the screens Last edited by BillA; 02-14-2006 at 07:32 AM.