Suspended obstructions within 18" of the Deck
Suspended obstructions within 18" of the Deck
(OP)
I have a situation (light hazard, unobstructed construction) where each office contains both ductwork and 2X4 flourescent lights suspended from the ceiling all within the 18" envelope from the roof deck. There are no ceilings, everything is open to structure. The roof is sloped (.5:12) so there are some areas where the ductwork is tight to the roof deck so it's easy enough to apply the beam rule in that case but the other areas are becoming murky to me. I have some spaces where there is a 5" to 10" variable gap between the roof deck and the top of the ductwork. My deflectors are going to be within 1-12" from the deck. Seeing how there is this gap here it would seem to me the beam rule would not be used which then puts me into the 3X rule which exempts non-structural elements. So perhaps the suspended or floor mounted obstruction rules of 8.6.5.2.2? But that appears to be limited to 'privacy curtains, freestanding partitions, room dividers and SIMILAR OBSTRUCTIONS" - this whole section talks about privacy curtains and the likes... would this apply to ductwork below my deflector?





RE: Suspended obstructions within 18" of the Deck
Roughly how many sq ft are the offices
RE: Suspended obstructions within 18" of the Deck
RE: Suspended obstructions within 18" of the Deck
Now if you are using Ex Cov sprinklers, then you need to be exact with the 3x rule. If you can't comply, then put heads under the duct or on both sides as needed to comply.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: Suspended obstructions within 18" of the Deck
RE: Suspended obstructions within 18" of the Deck
RE: Suspended obstructions within 18" of the Deck
RE: Suspended obstructions within 18" of the Deck
Located so you do not have obstructions