While the hermetic seal protects against fumes

you may also see "dusting" or metal shavings around the bearing seat

and 1611 frames

non-programmable low voltage thermostat designed specifically for 1-heat-only applications

making it an ideal choice for heat pump applications where bi-flow capability is required

York S1-028-04807-700 Sheave Els PW 17895 While the hermetic seal protectsThe York S1 028 04807 700 is an industrial grade single groove variable pitch sheave designed for precise airflow and speed modulation in belt driven HVACR systems. Constructed from heavy duty cast iron, this 1VM50 sheave features a 4. 75" outside diameter and a 7 8" fixed bore, making it a direct OEM replacement for York and Johnson Controls air handlers and furnace applications. The adjustable pitch range of 3. 3" to 4. 8" allows contractors to fine