Common Questions Is a keyway required for this specific 3/8" bore size

Whether you are troubleshooting a VAV control loop or upgrading a legacy Barber Colman network

Key Benefits for Technicians Environmental Protection: The NEMA 4X rated aluminum enclosure provides superior corrosion resistance and a weatherproof seal for harsh outdoor installations

Whether you are troubleshooting a unit that fails to kick on or one that is cycling erratically

Lennox 43H88 Relay Common Questions Is a keywayThe Lennox 43H88 Blower Relay is a heavy duty 3PDT (Three Pole Double Throw) electromagnetic switch engineered for precise load management in commercial and residential HVAC systems. Operating on a 24V coil voltage, this inductive rated relay is a direct replacement for the legacy Lennox 43H8801, ensuring a 1: 1 fit for technicians servicing Lennox packaged units and heat pumps. With a 15 Amp contact rating, the 43H88 provides the switching capacity