4. Rack installation connecter
3. Bearing block: coopersleeve or nylon Sleeve
2. Rack and pinion: curved or directly rack, nylon or cooper sleeve for the pinion
1. Gear motor : 550W/750W
Choose the best 
location for your frosty frame. In order to increase warmth and sunlight and your cold frame, pick an optimal area to put your structure. Choose a south-facing spot that provides lots of sunlight. Avoid spots near trees or other structures where snow or leaves can put on your cold body. This may result in damage to your structure or sunshine blockage.
Allow ventilation on hotter days. Too much warmth isn’t always a very important thing – and that’s the advantage of a cold framework greenhouse. Since outdoor sunshine and temperature impact a cold frame’s inner temperature, easily adapt your cold body during unseasonable heat waves. During these occasions, open up your structure and invite sufficient airflow to give plants desired warmth without suffocating them.
Use your cold frame for growing within your means. As stated previously, cold frames are great for extending the growing season of cool-time of year vegetables in the springtime and wintertime. When hardening off tender plants and seedlings, chilly frames also enable an easier transition for vegetation from inside to outside. Stick to options that survive within your location’s current climate range, not completely out-of-season plant varieties. The internal temperatures are only somewhat warmer and more managed than the outdoors. So, vegetation should deal with the highs and the lows of your area fairly well while protected in your cold frame.
The rack and pinion drive system is for the mult-span agriculture venlo greenhouse ventilation system, it can be used for the side window openingh or the roof widoiw opening system. The rack and pinion program move smoothly and dependable. and will be control automaticly.
Extend the season for cool-season crops. Because cool frames provide a somewhat warmer and more managed environment than external temps, these units help gardeners start plants without worry of frost or frozen floor. Plants won’t be affected by unseasonably cold or hot weather we often experience during spring and fall. Cold frames work great for cool-season plants because they can withstand the low evening temperatures.
Overwinter dormant plants. While a cold framework greenhouse won’t enable tender plants to continue growing through winter season, these structures can protect them during dormancy. When overwintering plants, minimize sunlight and keep maintaining adequate soil moisture. This ensures vegetation won’t attempt to grow but don’t completely dry out either.
Harden off delicate plants and seedlings. Cold framework greenhouses help plants make the changeover from indoor plants to outdoor vegetation. Whether you began seedlings in your house or a greenhouse, plant life must gradually adjust to the modify in temperature, sunlight, dampness, and exposure outside. With a cold body, plants are controllably exposed to these changes, while still remaining sufficiently shielded. Once plants change to the climate modify in your cold body, after that transplant them to your backyard.
Cold framework greenhouses are relatively simple to use for any or all of the gear rack for Greenhouse reasons listed above. However, keep these few tips in mind in order to maximize the benefits of your structure.