Honnecke ManufacturingSince 1964

Products

Premium furnace and A/C ducting designed to make systems easy to install and maintain. Every product is American-made from G90 galvanized steel.

Furnace & A/C Ducting

Classic Return Air Box

The Classic Return Air Box is the heart of our furnace system — engineered for fast installs and quick connection to all major furnace manufacturers. An oversized access door and choice of filter depth make routine service simple, from apartment-style spaces to large residential systems.

  • Connects quickly to all major furnace manufacturers
  • Oversized access door for easy filter service
  • Filter options: 1", 2", or 4"
  • Made from G90 galvanized steel
  • Adjusts to unique jobs to cut install time

Coil Spacers

Coil Transition (Coil Spacer)

The Coil Transition provides a clean transition between furnace and coil to improve airflow efficiency and reduce system stress. A single spring design reduces static pressure by 0.09″ and adapts to multiple configurations — square, rectangle, and offset — so one part covers many jobs.

  • Reduces static pressure by 0.09″
  • Single design fits multiple configurations
  • Improves furnace longevity
  • Easier maintenance, fewer warranty issues

Furnace & A/C Ducting

Side Air Filter Box

The Side Air Filter Box brings the same fast-connect, easy-service design to side-return applications where space is tight. Choose your filter depth and connect to major furnace platforms without custom fabrication.

  • Side-return design for tight mechanical rooms
  • Filter options: 1", 2", or 4"
  • Connects to major furnace manufacturers
  • Made from G90 galvanized steel

Ready to spec your next job?

Get a quote, request spec files, or talk through an install with someone who knows the products. Bulk and contractor pricing available.