It is a direct fit for several Lennox G40DF and G50DF series furnaces

and EV220B valves

Precision Tuning: Includes a cutout knob adjustment for field-calibrating high and low limits without removing the cover

This unit is a direct replacement for Antunes 8562120010 models requiring reliable freeze protection control and precise digital temperature monitoring in air handling units (AHUs)

Featuring a 26-inch diameter and a precise 32-degree pitch

Zonefirst AOBD-12X12 Blade Damper Els PW 29614 It is a direct fitThe Zonefirst AOBD 12X12 is a professional grade 12" x 12" automatic opposed blade damper designed to provide precise airflow management in commercial and residential HVAC zoning systems. Constructed from heavy duty extruded anodized aluminum, this damper features a low profile frame that allows for simple "slide in" installation through a standard 3 inch duct slot. Unlike parallel blade dampers, the opposed blade action provides a linear airflow