By design, the Propex furnace is a quiet and reliable way to heat your vehicle. The only noise you'll hear is the fan running and a soft low rumble of the combustion exhaust pipe. For those who want an even quieter experience, Van Cafe sells a complete 'stealth' retrofit kit for your HS2000.
The kit comes complete with mufflers for the combustion intake and exhaust, a section of specialized 'acoustic' ducting and the appropriate silicone connectors for easy installation. The felted acoustic ducting replaces the 60mm tan interior ducting that came with your heater installation package.
If you have an HS2211 heater, you can take advantage of the Stealth kit as well HOWEVER the acoustic ducting is NOT weatherproof like the ducting that came with your heater. You can use the acoustic ducting by joining it to the existing ducting inside the vehicle.
If you have an HS2800, the Stealth kit will not work for your application as both the combustion piping and hot air ducting are larger to accommodate the greater heat output of the heater.