This is the 10 Frame version of our all season inner cover.
Ventilation is very important to the health of the hive. It can be especially important in the winter in colder climates as well as during the heat of the summer. We have found an upper entrance so moisture can escape the hive in the winter combined with insulation so the moisture does not condense on the underside of inner cover and drip down on the cluster significantly improves overwintering success.
Developed over several years, we feel our all season inner cover provides not only appropriate ventilation and insulation during the winter, but also allows easy access for late or early season feeding, plus the benefits of passive cross flow ventilation during the summer without the cost of other systems. Compare it to the DE-Hive, the BeeCool Hive Ventilator, the Ventilated Hive Cover from Dadant, or the ventilated super from Walter T Kelly