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 cold frame. To be able to increase warmth and sunlight as well as your cold frame, pick an optimal location to put your structure. Choose a south-facing spot that offers lots of sunlight. Avoid places near trees or various other structures where snow or leaves can pile on your cold frame. This could result in harm to your structure or sunshine 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 sunshine and temperature influence a cold frame’s inner temperature, easily change your cold frame during unseasonable heat waves. During these occasions, open your structure and allow sufficient airflow to provide plants desired warmth without suffocating them.
Use your cold framework for growing within your means. As stated previously, cold frames are great for extending the growing season of cool-season vegetables in the springtime and winter. When hardening off tender plant life and seedlings, chilly frames also allow for an easier transition for vegetation from inside to outdoors. Stick to options that survive within your location’s current weather range, not completely out-of-season plant varieties. The internal temperatures are only somewhat warmer and more controlled compared to the outdoors. So, plant life should handle the highs and the lows of your area fairly well while guarded in your frosty frame.
The rack and pinion drive gear rack for Greenhouse system is for the mult-span agriculture venlo greenhouse ventilation system, it can be used for the medial side window openingh or the roof widoiw opening system. The rack and pinion system move smoothly and reliable. and can be control automaticly.
Extend the season for cool-time of year crops. Because chilly frames provide a slightly warmer and more controlled environment than external temps, these devices help gardeners start plant life without worry of frost or frozen ground. Plants won’t be suffering from unseasonably cold or warm weather we often encounter 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 frame greenhouse won’t allow tender plants to keep growing through wintertime, these structures can protect them during dormancy. When overwintering plants, minimize sunlight and keep maintaining adequate soil moisture. This ensures plant life won’t attempt to develop but don’t completely dry out either.
Harden off delicate vegetation and seedlings. Cold framework greenhouses help vegetation make the changeover from indoor vegetation to outdoor plants. Whether you started seedlings in your house or a greenhouse, plants must gradually adjust to the modify in temperature, sunlight, dampness, and exposure outside. With a cold framework, plants are controllably subjected to these changes, while still staying sufficiently shielded. Once plants change to the climate modify in your cold body, then transplant them to your garden.
Cold body greenhouses are not at all hard to use for any or all the reasons listed above. However, keep these few tips in mind to be able to maximize the benefits of your structure.