Smoke Detectors In Non-ducted HVAC Systems

[north star]

% ~ %

We have a new bldg. being proposed and we are reviewing
the blueprints on it.....We are using the `12 Codes &
Standards, except for NFPA 72 which is the 2013 edition.

The plan is to have A\C mini-split units installed in multiple
locations, so there will not be any HVAC ducting.

We are using NFPA 72 and trying to determine if Smoke
Detectors are required........I see language in NFPA 72
related to installing the detectors in ducted systems, but
am having difficulty in locating the requirements for
non-ducted systems.

Any input will be greatly appreciated.

% ~ %

 

[cda]

are you also using IMC?

No matter what, are the units over 2000 CFM??? More than likely not.

If not over, not required.

If over, than lets talk

 

[Builder Bob]

mini-split units are not larger enough to have an air handler of over 2000 cfm , thus not required for shutdown.

 

[north star]

$ ~ $

Thanks for your input !

Yes, we are using the IMC and the UFC's.

Any Smokes required for open areas, with these
mini-splits ?

$ ~ $

 

[cda]

Nope

 

[TheCommish]

Duct smoke detection is in NFPA 90A, 6.4.2.1, since there are no ducts I would say that detection is not required

 

[cda]

Don’t need ducks to require duck detection,,,

Only in hunting

 

[steveray]

Typically the requirement goes away if there is not a way for the unit to spread the smoke beyond the room of origin...(no ducts)....In other words, if you are standing in a room full of smoke and thr RTU is recirculating it, who cares...

 

[cda]

Typically the requirement goes away if there is not a way for the unit to spread the smoke beyond the room of origin...(no ducts)....In other words, if you are standing in a room full of smoke and thr RTU is recirculating it, who cares...

Agree with the one hvac,, one room rule