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Thermatic-Vent®
$39.95
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Thermatic-Vent®
Automatic cold frame vent USES NO ELECTRICITY! Opens and closes by a temperature-sensitive spring mechanism. Range 40ºF to 70ºF. Install one front vent for intake and one high in the back for a warm air exit. Size: 10" x 18" x 3.5" Easily installs in...
$39.95