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Smoke Hatches

Smoke Hatches

Smoke Hatches

Is there any code requirement for the smoke hatches in the large warehouse. I have never came across for such requirement in any of my previous project but previous consultant has proposed smoke hatches in the roof of warehouse. I believe these smoke hatches to be interlocked with fire alarm system for an automatic opening in the event of fire.

We have several fire compartments in the warehouse with fire rated exit doors for evacuation purpose. I am currently planning to remove these hatches from the project as it significantly increasing the project cost. Any input on this would be highly appreciated.

RE: Smoke Hatches

Not enough info

A lot of variables

RE: Smoke Hatches

I am currently doing some research on this, will let you know soon.

RE: Smoke Hatches

Is this the same warehouse with ESFR sprinklers, if so see below from NFPA 13, 2013 ED

2.1.1 Roof Vents and Draft Curtains. See Section C.6.* Manually operated roof vents or automatic roof vents with operating elements that have a higher temperature classification than the automatic sprinklers shall be permitted. Early suppression fast-response (ESFR) sprinklers shall not be used in buildings with automatic heat or smoke vents unless the vents use a high-temperature rated, standard response operating mechanism.

The problem is if the vents open before the sprinklers activate and release the heat needed to activate the sprinklers they may not activate.

RE: Smoke Hatches

Although roof vents would create an updraft that would help in the spread of fire, the smoke has to still be vented to aid in fire fighting efforts within the warehouse. Roof vents is not an unusual requirement.

RE: Smoke Hatches

FM says the following in FM Data Sheet 2-0 Heat and/or Smoke Vents and Other Exhaust Openings at Ceiling Level Heat and/or Smoke Vents

Do not install automatic smoke and heat vents in facilities equipped with sprinkler protection; manual heat and smoke vents, however, are acceptable. If local codes require the installation of automatic smoke and heat vents, do one of the following:

a) Install vents that are FM Approved for occupancies protected by quick-response Storage sprinklers.
(b) Install FM Approved vents equipped with a standard response 360°F (182°C) nominal thermal activating device.
(c) Install quick-response sprinklers directly under the vent opening on a maximum 4 ft (1.2 m) linear and 16 ft2 (1.5 m2) area spacing. Position the centerline of the sprinkler’s thermal element in accordance with the guidelines outlined in Section Ensure these sprinklers have, at a minimum, the same K-factor and orientation as the adjacent ceiling-level sprinklers and are fed by sprinkler piping no smaller than the ceiling level branchlines. Sprinklers located under the ceiling vent and installed as outlined above do not need to be added to the hydraulic design of the ceiling sprinkler system. See Figure 24a for a diagram of this arrangement.
Do not install drop-out-type heat vents over storage areas. If local codes require the installation of drop-out- type heat vents over storage areas, install vents that are FM Approved for occupancies protected by quick-response Storage sprinklers.

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