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INTUMET™ Intumescent Technology | Positive-Pressure Solutions for Doors | INTUMET Firestopping Solutions

Positive Pressure Listing Categories -- U.S.

U.S testing agencies have agreed on standardized definitions for listing fire and smoke doors tested under positive pressure code requirements. Definitions are provided here for the categories applicable to ZERO's products. Every system or assembly must be identified by a label bearing specified information, including the listing agency's certification mark.

CATEGORY A Doors – No additional edge-sealing system required
This category includes doors that do not require the use of any intumescent in either the frame or the door. It also includes doors evaluated with intumescence incorporated into the edge of the door by the manufacturer.

Category A doors are eligible to bear the "S" label for Smoke & Draft Control assemblies if a listed Category H "Smoke & Draft Control Gasket" has been applied to the assembly.

CATEGORY B Doors – Additional edge-sealing system required
This category includes doors that require add-on intumescent sealing systems either surface-applied or built into the frame in order to meet positive-pressure fire test requirements.

Category B doors are eligible to bear the "S" label for Smoke & Draft Control assemblies if a listed Category H "Smoke & Draft Control Gasket" has been applied to the assembly.




CATEGORY C Frames

CATEGORY D Door/ Frame Assemblies

CATEGORY E Hardware

CATEGORY F Light Kits

CATEGORY G Edge-Sealing Systems
This category includes intumescent-type systems that are surface-applied (such as kerf applied, adhesive-backed or mechanically attached) to frames or doors. It includes meeting edge seals for use in pair and double-egress assemblies.

CATEGORY H Smoke and Draft Control Gasketing
This category includes gasket systems that are surface-applied (such as kerf applied, adhesive-backed or mechanically attached) to frames or doors. It includes gasketing for the meeting edge for use in pair and double-egress assemblies. These gasket systems have been evaluated in accordance with UBC 7-2, Parts I and II. NOTE: This category covers gasket systems that have been evaluated for use in positive-pressure-rated assemblies, but do not provide an edge-sealing system to the opening (see Category G).

CATEGORY I Smoke and Draft Control Assemblies (for non-swinging doors)