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smoke dampers
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Re: smoke dampers By  cbo_3050

Posts: 0

2/14/2005 5:26:00 AM

Could be that smoke barriers and smoke partitions are mixed up terminology in the code (one of the two). Smoke partitions don''t come up until 2003 IBC though. My understanding is smoke barriers require the damper in the IBC. Smoke partitions do not (2003 IBC), unless the penetration an air transfer opening.

My personal opinion is the code has a long way to go in its written explanation of the requirements. The 2003 IBC and IMC appear to conflict in many regards with respect to this issue.


   

Re: smoke dampers By  phl

Posts: 0

5/16/2008 7:11:00 AM

Anyone know if the NFPA-101 people have attempted to change the IBC and IMC codes to delete smoke dampers in smoke barriers in healthcare occupancies (with quick response sprinklers, fully ducted)? There is still a disconnect between the documents. Is there any documentation available supporting the NFPA-101 position?


   

Re: smoke dampers By  pdove

Posts: 0

5/16/2008 12:13:00 PM

The intention of the 101 exception:

[(2)] This exemption anticipates that fire size will be limited by automatic sprinklers and that duct systems will also inhibit the transfer of smoke. This exemption does not prohibit the installation of smoke dampers, nor does it permit the omission of the smoke damper if the damper is required for other reasons. For example, if the building has a smoke-control system that needs a smoke damper at the smoke barrier, then such a damper must be installed. An automatic-closing damper, activated by a smoke detector, would be required to protect a transfer grille.

With regards to 101- people proposing to IBC & IMC the answer is yes but as you probably know, the code official majority make-up on the committees responsible for correlations in these two documents has a hard time agreeing. You can research the two bodies proposal history to see the proposals submitted and rejected.

Former NFPA 101 TC Member
Fire Protection Features


   

Re: smoke dampers By  Dr. J

Posts: 0

5/19/2008 9:30:00 AM

djr, you are not missing anything. The IBC is simply more restrictive in this particular issue, although it does have an exception for dampers in a smoke barrier for a ducted system where there are openings only in one smoke compartment.

In healthcare work, one is always needing to meet the more restrictive of several "codes". The trick is to identify which code the requirement comes from, so the appropriate measures and exceptions can be applied.


   

Re: smoke dampers By  phl

Posts: 0

5/19/2008 9:56:00 AM

Thanks for the additional dialogue. Here is the gist of the Formal Interpretation Request I just sent in to the NFPA 101 folks:

NFPA-101, 2006 Edition, paragraph 18.3.7.4(2) states that ?Smoke dampers shall not be required in duct penetrations of smoke barriers in fully ducted heating, ventilating and air-conditioning systems.? In the Annex A it states that ?Ducting is required to connect at both sides of the opening and to extend into adjacent spaces away from the wall.?

Technical Question 1: Is the definition of ?fully ducted? from Annex A.32.3.3.7.10 ?The term fully ducted means the supply and return air systems are provided with continuous ducts from all air registers to the air-handling unit.? applicable to paragraph 18.3.7.4(2) ?

Background Question 1:

I have some indication to what ?fully ducted? may possibly mean via some other references:

IBC 2006: 716.5.5 "A listed smoke damper ... provided at each point a duct ...penetrates a smoke barrier." Exception states they are not required ?where openings are limited to a single smoke compartment and the ducts are constructed of steel?.

IMC-2006: 607.5.4: "A listed smoke damper designed to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates a smoke barrier wall or corridor enclosure required to have smoke and draft control doors..." There are exceptions to requiring dampers ?where the openings in ducts are limited to a single smoke compartment and the ducts are constructed of steel?.

IMC-2006: 607.5.2 under one of the fire barrier damper exceptions it states ?For the purposes of this exception, a ducted HVAC system shall be a duct system for the structure?s HVAC system. Such a duct system shall be constructed of sheet steel not less than 26 gage thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals.?

These other references seem to imply that ?fully ducted? requires the duct to be fully ?constructed of steel duct?. The IMC 607.5.2 reference would imply that ?fully ducted? is ?continuous from the air-handling appliance or equipment to the air outlet and inlet terminals?. Combining these two yields that ?fully ducted? could be defined as ?continuous from the air-handling appliance or equipment to the air outlet and inlet terminals with ductwork constructed of steel?.

Technical Question 2: Are flexible air ducts Class 0 or Class 1 tested in accordance with UL 181 and installed in conformance with the conditions of the listing (see NFPA-90A-2002 4.3.1.2) permitted to be used in ?fully ducted? systems as applicable to paragraph 18.3.7.4(2)?

Technical Question 3: Are air connectors Class 0 or Class 1 tested in accordance with UL 181 and installed in conformance with the conditions of the listing (see NFPA-90A-2002 4.3.2) permitted to be used in ?fully ducted? systems as applicable to paragraph 18.3.7.4(2)?

Technical Question 4: In determining what ?away from the wall? refers to in the explanatory information in Annex A, is there a minimum distance which ?fully ducted? ducting is ?required? to ?extend into adjacent spaces away from the wall? as applicable to paragraph 18.3.7.4(2)?

Technical Question 5: If ducting is ?fully ducted? wherever the duct is located above an enclosed space which has a smoke barrier for one of it?s enclosure walls does this meet the recommendations of Annex A as applicable to paragraph 18.3.7.4(2)?

Background Question 5:

One could possibly assume that being fully ducted into the next space beyond the space immediately adjacent to the smoke barrier wall (the next room over from the smoke barrier wall) would meet the recommendation of Annex A.

Technical Question 6: With the determination of a recommended minimum distance from Technical Question 4, is it allowable that ductwork which extends beyond this distance to not be ?fully ducted? as applicable to paragraph 18.3.7.4(2)?

Background Question 6:

If the ?fully ducted? system need to only ?extend into adjacent spaces away from the wall? then the remaining spaces could then be served by a system which is ?not fully ducted?.

Technical Question 7: Must the entire ductwork system which penetrates a smoke barrier be ?fully ducted? on both sides of the smoke barrier as applicable to paragraph 18.3.7.4(2)?

Technical Question 8: Is there a maximum cumulative amount (as measured in square feet) of unprotected openings through a smoke barrier that a ?fully ducted? ductwork system which penetrates a smoke barrier must not exceed as applicable to paragraph 18.3.7.4(2)?


   

Re: smoke dampers By  phl

Posts: 0

5/19/2008 9:56:00 AM

Thanks for the additional dialogue. Here is the gist of the Formal Interpretation Request I just sent in to the NFPA 101 folks:

NFPA-101, 2006 Edition, paragraph 18.3.7.4(2) states that ?Smoke dampers shall not be required in duct penetrations of smoke barriers in fully ducted heating, ventilating and air-conditioning systems.? In the Annex A it states that ?Ducting is required to connect at both sides of the opening and to extend into adjacent spaces away from the wall.?

Technical Question 1: Is the definition of ?fully ducted? from Annex A.32.3.3.7.10 ?The term fully ducted means the supply and return air systems are provided with continuous ducts from all air registers to the air-handling unit.? applicable to paragraph 18.3.7.4(2) ?

Background Question 1:

I have some indication to what ?fully ducted? may possibly mean via some other references:

IBC 2006: 716.5.5 "A listed smoke damper ... provided at each point a duct ...penetrates a smoke barrier." Exception states they are not required ?where openings are limited to a single smoke compartment and the ducts are constructed of steel?.

IMC-2006: 607.5.4: "A listed smoke damper designed to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates a smoke barrier wall or corridor enclosure required to have smoke and draft control doors..." There are exceptions to requiring dampers ?where the openings in ducts are limited to a single smoke compartment and the ducts are constructed of steel?.

IMC-2006: 607.5.2 under one of the fire barrier damper exceptions it states ?For the purposes of this exception, a ducted HVAC system shall be a duct system for the structure?s HVAC system. Such a duct system shall be constructed of sheet steel not less than 26 gage thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals.?

These other references seem to imply that ?fully ducted? requires the duct to be fully ?constructed of steel duct?. The IMC 607.5.2 reference would imply that ?fully ducted? is ?continuous from the air-handling appliance or equipment to the air outlet and inlet terminals?. Combining these two yields that ?fully ducted? could be defined as ?continuous from the air-handling appliance or equipment to the air outlet and inlet terminals with ductwork constructed of steel?.

Technical Question 2: Are flexible air ducts Class 0 or Class 1 tested in accordance with UL 181 and installed in conformance with the conditions of the listing (see NFPA-90A-2002 4.3.1.2) permitted to be used in ?fully ducted? systems as applicable to paragraph 18.3.7.4(2)?

Technical Question 3: Are air connectors Class 0 or Class 1 tested in accordance with UL 181 and installed in conformance with the conditions of the listing (see NFPA-90A-2002 4.3.2) permitted to be used in ?fully ducted? systems as applicable to paragraph 18.3.7.4(2)?

Technical Question 4: In determining what ?away from the wall? refers to in the explanatory information in Annex A, is there a minimum distance which ?fully ducted? ducting is ?required? to ?extend into adjacent spaces away from the wall? as applicable to paragraph 18.3.7.4(2)?

Technical Question 5: If ducting is ?fully ducted? wherever the duct is located above an enclosed space which has a smoke barrier for one of it?s enclosure walls does this meet the recommendations of Annex A as applicable to paragraph 18.3.7.4(2)?

Background Question 5:

One could possibly assume that being fully ducted into the next space beyond the space immediately adjacent to the smoke barrier wall (the next room over from the smoke barrier wall) would meet the recommendation of Annex A.

Technical Question 6: With the determination of a recommended minimum distance from Technical Question 4, is it allowable that ductwork which extends beyond this distance to not be ?fully ducted? as applicable to paragraph 18.3.7.4(2)?

Background Question 6:

If the ?fully ducted? system need to only ?extend into adjacent spaces away from the wall? then the remaining spaces could then be served by a system which is ?not fully ducted?.

Technical Question 7: Must the entire ductwork system which penetrates a smoke barrier be ?fully ducted? on both sides of the smoke barrier as applicable to paragraph 18.3.7.4(2)?

Technical Question 8: Is there a maximum cumulative amount (as measured in square feet) of unprotected openings through a smoke barrier that a ?fully ducted? ductwork system which penetrates a smoke barrier must not exceed as applicable to paragraph 18.3.7.4(2)?


   

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