4. Rack installation connecter
3. Bearing prevent: coopersleeve or nylon Sleeve
2. Rack and pinion: curved or straight rack, nylon or cooper sleeve for the pinion
1. Gear motor : 550W/750W
Choose the right location for your cool frame. To be able to maximize warmth and sunlight as well as your cold frame, choose an optimal area to place your structure. Choose a south-facing spot that offers plenty of sunlight. Avoid places near trees or additional structures where snow or leaves can pile on your cold framework. This may result in harm to your structure or sunlight blockage.
Allow ventilation on hotter days. An excessive amount of warmth is not always a very important thing – and that’s the benefit of a cold framework greenhouse. Since outdoor sunlight and temperature impact a cold frame’s inner temperature, easily adapt your cold framework during unseasonable heat waves. During these occasions, open your structure and allow sufficient airflow to give plants preferred warmth without suffocating them.
Use your cold body for growing inside your means. As stated previously, cold frames are excellent for extending the growing season of cool-season vegetables in the spring and winter. When hardening 
off tender vegetation and seedlings, cold frames also enable an easier transition for plants from inside to outdoors. Stick to options that survive within your location’s current climate range, not completely out-of-season plant types. The internal temperatures are only slightly warmer and more managed compared to the outdoors. So, plants should manage the highs and the lows of your area fairly well while protected in your frosty frame.
The rack and pinion drive system is for the mult-span agriculture venlo gear rack for Greenhouse greenhouse ventilation system, it can be used for the medial side window openingh or the roof widoiw opening system. The rack and pinion program move smoothly and reliable. and can be control automaticly.
Extend the season for cool-period crops. Because frosty frames provide a slightly warmer and more controlled environment than external temperatures, these units help gardeners start vegetation without worry of frost or frozen floor. Plants won’t be suffering from unseasonably cold or hot weather we often encounter during springtime and fall. Cool frames work ideal for cool-season plants as they can withstand the lower evening temperatures.
Overwinter dormant plant life. While a cold body greenhouse won’t enable tender plants to continue growing through winter, these structures can protect them during dormancy. When overwintering vegetation, minimize sunlight and keep maintaining adequate soil moisture. This ensures vegetation won’t attempt to develop but don’t completely dry either.
Harden off delicate plant life and seedlings. Cold frame greenhouses help vegetation make the transition from indoor vegetation to outdoor vegetation. Whether you started seedlings in your home or a greenhouse, plants must gradually adapt to the change in temperature, sunlight, moisture, and exposure outdoors. With a cold framework, plants are controllably subjected to these changes, while still keeping sufficiently protected. Once plants adapt to the climate alter in your cold frame, then transplant them to your backyard.
Cold frame greenhouses are relatively simple to use for just about any or all the reasons listed above. However, keep these couple of tips in mind in order to maximize the benefits of your structure.