Aprilaire 4977 Relay 321894-706 This is the recommended direct

This is the recommended direct replacement

The Carrier RPC9803 is a professional-grade washable metal mesh filter designed for high-velocity air movement and harsh operating environments

this reversible filter drier is fully compatible with R-410A

Industrial-Grade Durability: Built to withstand high-temperature environments inside heat exchangers and burner boxes

Aprilaire 4977 Relay 321894-706 This is the recommended directThe Aprilaire 4977 Relay is a high performance 24v Coil DPDT Relay designed for seamless integration within advanced HVACR systems. This versatile double pole double throw relay serves as a critical HVAC control component, allowing for the simultaneous management of two independent circuits. Engineered for Aprilaire humidifiers and air cleaners, this 24 volt switching relay ensures precise electrical isolation and reliable secondary hardware