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Is a vent limiting device required
standard T100 timers require the 156T1978A series
Key Benefits for HVAC Professionals Precise 0
Enhanced Safety: Prevents gas valve energization if the venting system is obstructed or the draft inducer fails to meet the required CFM
ZoneFirst SPRD-12X10 Damper Els PW 17895 Is a vent limiting deviceEstablishing proper bypass airflow is essential for any multi zone residential or light commercial system, and the ZoneFirst SPRD 12X10 provides a reliable, barometric solution for managing static pressure. This 12" wide by 10" high barometric relief damper is engineered to automatically divert excess air back to the return air plenum when zone dampers close, preventing high velocity noise and maintaining consistent CFM delivery across active zones.
