Paradise boxes are made in Finland. The director and owner Juhani Vaara is a friend of mine.
http://paradisehoney.net/en/
From their net site:
"In the normal position the top of the
hive closes tightly. It should be used in combination with a plastic sheet placed on the top bars of the combs. The top can be secured against strong winds with a stone or brick weighing about 2 kg. During migration it is secured with a strap.
The 95 mm high bottom board of the BeeBox Hive has scalloped edges and an aluminum screen bottom
to maximize ventilation. When fully open the flight entrance is 18 mm high. It is possible to slide a Varroa monitoring board under the screen and close the bottom opening.
The hives are recommended to be kept on pallets above the ground
to ensure adequate air movement through the screen bottom at all times.
Generally the screen bottom is kept open.
The ventilation through the mesh improves the wintering results. Not even dead bees and other debris can block the air movement during
winter. The hives survive even in situations where the entrance is blocked by ice. During wintering condensed water will run down through the screen bottom.
After the cleansing flight the bees start to rear more brood. At this time it is advantageous to slide the Varroa-monitoring board in place. This prevents any draft in the hive through the screen bottom. Without a cooling draft, bees will expand their brood nest considerably faster. During spring the entrance can be kept reduced to a height of 8 mm. "