SM 21 UP/H SUP INSU Image
Image may be representative

SM 21 UP/H SUP INSU

19.875" X 20" Insu 1" Plenum For 21" Wide Furnace
    Stocked across our regional branch network — sign in for live availability.
    Competitive contractor pricing — sign in to see your price.
    Sign in to order items
    WARNING
    Cancer and Reproductive Harm. www.P65Warnings.ca.gov

    Frequently Bought Together

    SM 21 UP/H RET DF S INSU image

    SM 21 UP/H RET DF S INSU

    18.625" X 23.625" Insu 1" Plenum For 21" Wide Furnace

    MARS 84137 image

    MARS 84137

    3/4 X 6' 8GA Non-Metallic Whip/ Non-Metallic Fittings

    RUUD RCFY6021STAAMC image

    RUUD RCFY6021STAAMC

    A2L 5 Ton R454B Multi Position Cased Coil Stnd Eff 21" Wide w/A2L Sensor TXV

    RUUD RCFY4821STANMC image

    RUUD RCFY4821STANMC

    A2L 4 Ton R454B Multi Position Cased Coil Stnd Eff 21" Wide w/A2L Sensor TXV

    MARS 80317 image

    MARS 80317

    60 Amp 2 Pole 240 Volt Fused Pullout Disconnect

    PAD 36X36X3 PLAS image

    PAD 36X36X3 PLAS

    36X36X3 Plastic A/C Condenser Pad

    RUDP RXGW-C01 image

    RUDP RXGW-C01

    4 Inch Flue Adapter Kit

    RUUD RA14AY60AJ1NA image

    RUUD RA14AY60AJ1NA

    A2L 14 Seer2 5 Ton R454B Single Stage Air Conditioner 208/230-1

    RUUD R801T1005A21UHNNAS image

    RUUD R801T1005A21UHNNAS

    80% Single Stage 100K Upflow/Horiz Up to 5 Ton 21W low Nox Non Com

    RUUD R801V1005A21UHNCAP image

    RUUD R801V1005A21UHNCAP

    80% Single Stage 100K Upflow/Horiz Up to 5 Ton Vari Spd 21W Low Nox

    FILB 2025 image

    FILB 2025

    Filter Base 20X25 Upflow/Horiz for Gas Furnaces

    DIV 6-3060L image

    DIV 6-3060L

    Secondary Plastic Drain Pan 30 X 60