Why is it necessary to ventilate my garden?
There are two main reasons to keep fresh air flowing through your garden:
1) to evacuate excess heat generated by lamps, pumps, etc.
2) to provide fresh air (i.e. oxygen and carbon dioxide) to your plants while removing the excess humidity they generate.
A high-wattage lamp in a sealed, unventilated room will quickly raise the ambient temperature to 100+ degrees Fahrenheit. At these temperatures, plants grow slowly (if at all) and can succumb to heat stress, or may simply die. Barring issues caused by temperature, without...