RMPU BELLOW DUCTS
These are flexible fabric ducts (bellows type) used to carry air between RMPU & coach interiors.
1. Fresh Air Duct
- Brings outside air into the HVAC system
- Ensures ventilation and oxygen supply
2. Supply Air Duct
- Carries cooled air from RMPU → passenger area
- Main duct responsible for comfort
3. Return Air Duct
- Pulls used/warm air from coach → HVAC unit
- Enables recirculation and filtering
Key Highlights:
- (i). Materials: Meta-Aramid / Para-Aramid Fabric
- (ii). Ambient: -10 to +55 °C
- (iii). Flame retardant: R1: HL3 of EN 45545-2: 2023
- (iv). Maximum Ph value: 8.5
