Starting with the development of the first zoning dampers and registers in the 1950s to today, with exclusive Plug & Play dampers  Zonefirst has led the way in excellence and continued innovation.
ZONEFIRST is the first company that successfully developed and marketed HVAC Zoning Systems back in the 1950s and is today a leading manufacturer of HVAC zone dampers and zoning systems. Several other major zoning companies are in business due to ZONEFIRST.
It was in the mid to late 1950s when Richard Foster developed the first automatic motorized dampers, registers and difusers that were thermostatically controlled. He marketed these products under the trade name Zone-A-Trol with another company when in 1964 he founded Trolex Corporation and the start of the well known trade name Trol-A-Temp. In 1999 the Trol-A-Temp brand was acquired by Honeywell.
Since that time, Trolex has continued to manufacture zone dampers for a number of OEMs. In 2004 Trolex re-entered the HVAC market as ZONE-A-TROL and later the ZONEFIRST tradename. This new name signifies the many firsts the company has developed in the HVAC industry. We were the first company to develop automatic dampers, registers, and diffusers for zoning, centralized zone controllers, the first zoning system to feature normally open dampers and the first to zone heat pumps in the early 1970s

Zone First ZDB0818

Honeywell SPRD08 Zonefirst SPRD Static Pressure Bypass Regulating Damper 8"

Honeywell SPRD08

Resideo SV9602P4832 Gas Valve Natural Gas 3/4" 24 VAC Step Opening,

Resideo SV9602P4832

Resideo TK30PV100SFM Boiler Trim Kit W/Air Purger 4.4 Gallon 1/2" MPT Tank 1" OD 100 psi,

Resideo TK30PV100SFM

Honeywell Home 32001676-001 Circuit Board W/Transformer,

Honeywell 32001676-001

Honeywell Home Automatic Round Damper power-close, spring-open models ensure low leakage while controlling circulating air in heating, cooling and ventilation systems.

Honeywell ARD7TZ

Resideo TK300-30 Expansion Tank 4.4 Gallon 11 x 15-1/2" H,

Resideo TK300-30

Honeywell V8043B1027 Zone Valve 2-Way Normally Open24 VAC Straight 3/4" OD

ECR International Heating Parts 240009241 Control S9361A2070,

ECR International Heating Parts 240009241

Resideo 390427E Reducer Bushing for Combination Gas Controls,

Resideo 390427E

Honeywell Home 50027997-001 Tru-Steam Solenoid Valve

Honeywell 50027997-001

Honeywell Home 50033181-001/U Large Humidifier Water Tank, for use with HM509, HM512, HM609 HM612 and TrueSTEAM Humidifier

Replacement tank, spool valve, new gasket, gasket tool, instructions



Honeywell 50033181-001