These would not be heater ducts, either supply or return, as there are no mechanicals moving the air, merely thermo-siphon, which is occurring naturally in the room anyway. This contrivance is not blowing heat away nor sucking it away from the head, but merely allowing air (heat) to more easily infiltrate through the low R value drywall to the pipe. The purpose of the insulation is to keep the cold side cold (outside) and the hot side hot (inside), or at least to retard the transference of the hot to the cold. If the homeowner is not an ice giant (not too many left since being hunted down by Odin) we can presume he'll keep his house, with the pipe on the hot side, somewheres in the fifties to sixties range all the time (the coldest my insulated garage has ever gotten is 40ish although unheated and after a week of outside temperatures never getting above twenty-five) and as long as his heating plant can keep up with his heat loss the air near (or in) (no touching means no direct conduction and I can beat radiation and convection easily) the ceiling having any R value will be at room temperature, not outside temperature. The better the R value the smaller the heat planet can be. Maybe we all need to go back to our Basic Physics text and read Section Six: Heat.
On Fri, Jun 24, 2011 at 12:00 PM, A.P.Silva <[email protected]> wrote: > Blazemaster installation manual, which would be complying with the listing > requirements. > > Tony > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Todd > Williams > Sent: June 24, 2011 12:57 PM > To: [email protected] > Subject: RE: Channel in roof joists > > Where does the 12" restriction come from? > > > At 02:47 PM 6/24/2011, you wrote: > >If you go with 2 grates to permit air flow, the temperature in the > >channel should be closer to the room side of the insulation than that > >on the other side of the insulation. I would be concerned if there were > >no grates. Make sure you don't use plastic piping, as otherwise there > >will be an additional restriction of having a head within 12 inches of the > grates. > > > >Tony > > > >-----Original Message----- > >From: [email protected] > >[mailto:[email protected]] On Behalf Of Todd > >Williams > >Sent: June 24, 2011 8:15 AM > >To: [email protected] > >Subject: Channel in roof joists > > > >Sorry, forgot title > > > >At 10:09 AM 6/24/2011, you wrote: > >>I am working on a small mixed-use building with commercial space on > >>the first floor and an apartment with loft above. Part of the > >>apartment has a cathedral ceiling, which needs to have sprinklers on > >>the slope. No other options. The roof is framed with 2x10s and they > >>plan to use a spray in foam insulation the entire depth of the joists. > >>My thought was if they took one joist bay and only put 5" of > >>insulation and create a space to run the pipe. Would that be > >>sufficient to prevent pipe from freezing? I also thought about putting > >>a small grate at the bottom and top of the channel to allow heat to > >>flow into the space. Has anyone done anything like that before? > >>Thoughts on weather it would work? Not a lot of options and I don't > >>want to go with an antifreeze system > >> > >>Todd G. Williams, PE > >>Fire Protection Design/Consulting > >>Stonington, CT > >>860.535.2080 > >>www.fpdc.com > >> > >>_______________________________________________ > >>Sprinklerforum mailing list > >>[email protected] > >>http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > >> > >>For Technical Assistance, send an email to: [email protected] > >> > >>To Unsubscribe, send an email > >>to:[email protected] > >>(Put the word unsubscribe in the subject field) > > > >Todd G. Williams, PE > >Fire Protection Design/Consulting > >Stonington, CT > >860.535.2080 > >www.fpdc.com > > > >_______________________________________________ > >Sprinklerforum mailing list > >[email protected] > >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > >For Technical Assistance, send an email to: [email protected] > > > >To Unsubscribe, send an email > >to:[email protected] > >(Put the word unsubscribe in the subject field) > > > >_______________________________________________ > >Sprinklerforum mailing list > >[email protected] > >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > >For Technical Assistance, send an email to: [email protected] > > > >To Unsubscribe, send an email > >to:[email protected] > >(Put the word unsubscribe in the subject field) > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860.535.2080 > www.fpdc.com > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
