A hot air hose does not generate heat itself. It carries the warm supply air produced by a compatible heater to another part of a construction site, hall, tent or temporary working area.

This can allow the heater to remain at a suitable operating position while the warm air is directed to the required zone. The heater, hose and connection components must be treated as one system because the available airflow and outlet temperature depend on the complete configuration.

Do not select a hot air hose by appearance or approximate diameter alone. First check whether the heater is approved for hose operation and which hose family, connector and maximum configuration are specified for that model.

Some professional electric and indirect oil heaters have dedicated warm-air connections, while other heaters are not designed for ducted operation. Use only combinations supported by the heater and accessory documentation.

The hose diameter affects both mechanical compatibility and airflow through the system. Select the diameter specified for the heater outlet, distributor or connecting nozzle rather than adapting a smaller or larger hose without manufacturer approval.

Nominal hose and connector dimensions can differ between individual components, so use the stated compatibility information instead of selecting a connection solely because its diameter appears similar.

Current SP-T hoses are designed for a continuous temperature range of -20 °C to +80 °C and can tolerate hot air up to 100 °C temporarily. Current SP-C combination hoses are designed specifically for heater connections with a more heat-resistant section at the device end.

For current SP-C hoses, the first two metres are specified for temperatures up to +110 °C, while the subsequent hose section is rated up to +100 °C. Always compare these hose limits with the actual outlet conditions and the approved hose specification of the heater.

Many current SP-T and SP-C hoses use a standard length of 7.6 metres, but this does not mean that every heater can operate with the same total hose length. Each additional hose, bend, distributor or reduction adds resistance to the airflow.

Follow the maximum hose length and configuration specified for the heater. Do not extend a system merely because compatible sleeves allow several hose sections to be mechanically connected.

Flexible hot air hoses should be routed with smooth curves and sufficient space around the duct. Avoid sharp bends, crushing, kinking or objects that can obstruct the hose and increase the resistance to airflow.

Current SP-T and SP-C hoses are designed with a bending radius of approximately 0.5 times the hose diameter. The actual installation should still follow the heater and hose instructions, particularly where long runs or several direction changes are planned.

Professional warm-air installations can require connecting nozzles, tension straps, hose distributors or heater-specific adapters in addition to the hose itself. These components keep the connection secure and allow approved systems to be extended or divided.

Check every component for the correct diameter and application. A generic SP-series connector may allow hose sections to be joined mechanically, but the heater can still impose a shorter maximum total length or require a specific distributor at its outlet.

Hot air hoses transport the supply air intended for heating the working area. Exhaust pipes and flue components have a different purpose: they remove combustion gases from compatible indirect-fired heaters.

Never interchange the two systems. Use approved warm-air hoses for supply-air distribution and the specified exhaust components for combustion gases, following the installation requirements of the heater.

Hot air hoses can direct heated air into construction zones, temporary enclosures, halls or tents and can support a coordinated drying process by distributing warm air where it is required.

The hose itself does not control temperature or remove moisture. For building drying, combine the appropriate heater, air distribution and dehumidification equipment according to the actual project conditions rather than treating the duct as an independent drying solution.

Start with the heater and its approved hose connection, then configure the air-transport system around the permitted technical limits.

• Verify that the exact heater is approved for operation with a hot air hose;
• Choose the hose family and diameter specified for the heater outlet or approved adapter;
• Check the continuous and short-term temperature limits of the selected hose;
• Observe the maximum total hose length and permitted number of sections for the heater;
• Allow for additional airflow resistance from bends, distributors, reductions and long hose runs;
• Use the specified connecting nozzles, straps and heater-specific adapters to secure each connection;
• Route the hose without crushing, sharp bends or other restrictions to the warm-air flow;
• Keep warm-air distribution hoses clearly separate from combustion-gas exhaust components.