KEEPING WARM 
maintain good ventilation will probably 
mean increased home use of air-heat 
exchangers similar to those now used in 
some offices and public buildings. 
Air-heat exchangers operate by blow- 
ing hot air out of, and sucking cold air 
into, a building. The exchanger is a box, 
about the size of an average window air 
conditioner, that is installed in a ventila- 
tion system. One motor in the exchanger 
drives a fan that blows hot air out over a 
partition made of treated paper or plas- 
tic; a second motor drives another fan 
that blows cold air in from the outside 
over the same partition. The partition 
separates the two airflows in such a 
fashion that heat from the indoor, used 
air is transferred to the incoming, cold 
air. The trick is to design the exchanger 
so that the heat can be transferred with- 
out transferring the indoor pollutants to 
the incoming air. 
A number of air-heat exchange units 
for home use are now on the market. 
Some of these units are imported from 
Japan and Europe where high-cost en- 
ergy has made home heat conservation 
as essential as it is fast becoming 
here. □ 
1 ••'rrrm 
Exotic 
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Chinese cinnabar egg(s) @ $33.50 each. 4R0329 
D Cheque or money order enclosed. 
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1 17 
