Rector H E, Koontz M D, Cade D R, et al.
Bibliographic info:
Preprint. ASHRAE Transactions 1985, Vol 91, Pt 2. HI-85-39 No 2. 9p. 6 figs, 4 tabs, 6 refs.

The effects of retrofitting for building tightness, air-to-air heat exchangers, and HVAC circulation fans on radon and radon progeny levels were investigated using two matched test houses.