The good news is I finally got some hard facts about the great duct debate, I have demonstrated that 315 mm ducting does not interfere with the fire detection system as per the recommendation of the FIA, and I have also demonstrated that one 315 millimeter duct coupled with the fan we acquired from an urban tomato farmer comfortably meet the 2000 cubic meters per hour specification requested by the metal tecs.
So as soon as Shaun has built the new box for metalworks extraction fan we can install it hopefully before next weekend.
315mm duct set at a height that allows it to pass over the top of the table saw extraction with a five millimeter clearance.
On the plus side I’ve moved on from doing my calculations on the back of a fag packet to doing them on an old piece of scrap wood. I think that’s an improvement maybe one day I’ll graduates do using a spreadsheet
One run of 315mm with big box fan, 2nd fan set aside for metal if needed
Keep space for a 315mm or equivalent intake straight run from metal room to front of arch 2 (in case there is an issue with woodshop dust from being sucked into metal room due to negative pressure) replace window with 1/2 window (final routing tbd with metal and wood)
Welding filters to be bought for welding area
Swapping to use intake at the discretion of metaltechs
Woodwork to use 315 and nuaire inline fan as wood extraction, going over cnc to middle of woodshop
Thanks for agreeing this Andy! It really is the best way forward all things considered. With the work that Joe, Sean, @danielbenton, @Dan1 and others have put into this, everything is lined up to have that 315mm extraction duct installed in the next few days.
Those outdoor shots of the extraction trunking are putting me in mind of Gerald Bull’s infamous ‘Iraqi Supergun’, (a small part of which was, for a time, on show in Woolwich…).
I guess I’m just odd like that.
(Oh, and it appears to be aimed at the Houses of Parliament…)
