As a direct replacement Fenwal ignition module

this differential air pressure switch is the industry standard for verifying fan proof of flow and preventing unsafe operating conditions in commercial boilers and air handlers

the McDonnell & Miller 302500 is specifically sized for the Series 63 and E-28

Comprehensive Seal Package: Includes essential glass

this relay features Class B insulation and is rated for operational temperatures from -40°F to 149°F

Fenwal 12-E27121-000-05 Sensor Freon As a direct replacement FenwalAs an HVACR contractor, you know that reliable fire protection in commercial ducting and air handling equipment starts with the Fenwal 12 E27121 000 05. This Detect A Fire vertical mount heat detector is engineered with a rate compensation design, allowing it to accurately sense surrounding air temperature regardless of fire growth rate. Unlike standard rate of rise devices, the Fenwal heat sensor ignores transient thermal gradients to virtually