Lochinvar 100147166 5" Sidewall Vent Kit for EnergyRite® ER252 Heater - This 5" Sidewall Vent Kit is for use with the EnergyRite® ER252 Heater. This is a replacement kit. The kit includes installation instructions, a flue adapter, air pipe adapter, air inlet collar assembly, air inlet terminal, flexible steel re-enforced air hose, clamps, gaskets, and fasteners necessary to install the venting system.