Stop Heat Escaping Before It Reaches You
Up to 40% of a diesel heater's heat output can be lost through uninsulated ducting. Thermoduct is a purpose-built insulated sleeve that wraps around your warm air ducting and keeps that heat moving where it belongs — into your living space, not the chassis.
Sized for 75mm–90mm ducting, each sleeve is 750mm long. Order the quantity you need to cover your full duct run.

Why Builders Use It

Faster cabin warm-up — more heat reaches the vents, less is wasted
Better fuel efficiency — your heater doesn't have to work as hard
Lower battery draw — reduced run time for the same heat output
Moisture and water resistant — stands up to the under-floor environment
Durable outer fabric — built for long-term use, not a temporary fix
Closed-end stitched design — duct slides in cleanly, no snagging the insulation


Fits

Campervans and motorhomes
Off-grid and expedition vehicles
Caravans
Boats and marine applications
Commercial vehicles


Specifications

Suitable duct size: 75mm–90mm warm air ducting
Length: 750mm per section
Insulation material: 19mm Thinsulate™
Application: Warm air diesel heater duct insulation


Ordering
Sold per 750mm section. Adjust the quantity to match your total duct run length.

2 sections = 1.5 metres
4 sections = 3 metres