Hi all, great collection of info. With acknowledgments to Beacon and EDA Network, here’s a summary for clients I wrote some time ago for the EDAs:
Heat-transfer systems
For these to work well you need:
· enough heat at the source for all rooms you want to heat
· a heated room where the temperature at the ceiling exceeds 25-30C
· a fan capable of the maximum airflow required
· a thermostat to prevent the fan starting before the inlet air is hot enough
· insulated ducting to reduce heat losses
· duct runs as short as possible
· few outlets per fan – one or two outlets much better than three
· outlets located away from doors
· outlets in the room to be heated, not in the hallway adjacent
· a quiet fan (check claimed noise rating) properly suspended
· outlets whose flow can be adjusted, or closed if the room is not to be heated
· a flow path for the return air
· competent installation
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