1, long service life and durability 2, the use of support, practical Application: Air heater Material: stainless steel + plastic Color: silver Exhaust silencer: hole diameter: 24mm / total: 16x10cm Filter hole diameter: 25mm Package included: 2 x 24mm exhaust silencer 2 x 25mm Filter 2 x combustion air pipe 2 x exhaust pipe 8 x clamps Note: 1. Professional installation is highly recommended!!!! Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.