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The TPI 3420ex34 is a 4-inch surface mounting sleeve designed for installation with the 3420 and 3450 Series heavy-duty fan forced wall heaters. This sleeve provides the mechanical interface needed to mount the heater unit flush against or into a wall surface, ensuring proper fit and secure positioning during installation. It is a purpose-built accessory component intended for use by licensed HVAC technicians and qualified heating contractors performing new installations or replacement work on compatible TPI wall heater systems. Manufactured in the USA, the 3420ex34 is built to the dimensional and fit standards required for correct heater alignment and enclosure integrity.
This surface mounting sleeve is used in residential and light commercial wall heater installations where the 3420 or 3450 Series fan forced wall heater is being surface-mounted rather than recessed. It is a direct accessory for TPI heavy-duty fan forced wall heaters and is appropriate for use in retrofit or new-construction scenarios where wall-surface mounting is the specified installation method. Installers working on occupied spaces or renovation projects will find this sleeve provides the correct 4-inch sizing required by the heater series.
Designed for use with the TPI 3420 and 3450 Series heavy-duty fan forced wall heaters, as specified by the manufacturer.
Installation should be performed by a licensed HVAC technician or qualified contractor familiar with wall heater mounting requirements. Always disconnect power to the circuit at the breaker panel before beginning any heater or accessory installation. Verify wall framing and surface material are appropriate for the mounting sleeve dimensions before securing the unit. Follow all applicable local mechanical and electrical codes, including NEC requirements for heater clearances and wiring.
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