Brannstrom H.
Bibliographic info:
VVS Tidskrift 1981 vol.52 no.7-8 p.57 4 figs. #DATE 01:01:1981 in Swedish

Notes that a considerable amount of energy escapes past external doors and the simplest way to avoid this loss is to make sure that doors close properly. Illustrates methods to achieve tight doors and considers inadequacies of certain door closers. Considers potential for development and improvement of heated sluices.