4. Rack installation connecter
3. Bearing block: coopergear rack for automobile sleeve 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 cold frame. To be able to maximize warmth and sunlight and your cold frame, pick an optimal area to place your structure. Choose a south-facing spot that offers lots of sunlight. Avoid spots near trees or various other structures where snow or leaves can put on your cold frame. This may result in damage to your structure or sunshine blockage.
Allow ventilation on hotter days. An excessive amount of warmth is not always a good thing – and that’s the benefit of a cold framework greenhouse. Since outdoor sunlight and temperature influence a cold frame’s internal temperature, easily modify your cold framework during unseasonable temperature waves. Of these occasions, open your structure and allow sufficient airflow to provide plants preferred warmth without suffocating them.
Use your cold body for growing within your means. As mentioned previously, cool frames are excellent for extending the growing season of cool-period vegetables in the springtime and wintertime. When hardening off tender plant life and seedlings, chilly frames also enable a less strenuous transition for vegetation from inside to outside. Stick to options that survive within your location’s current climate range, not totally out-of-season plant varieties. The internal temperatures are only slightly warmer and more managed compared to the outdoors. So, vegetation 
should deal with the highs and the lows of your region fairly well while protected in your cool 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 reliable. and may be control automaticly.
Extend the season for cool-time of year crops. Because cool frames provide a somewhat warmer and more controlled environment than external temps, these units help gardeners start plants 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 low evening temperatures.
Overwinter dormant vegetation. While a cold framework greenhouse won’t allow tender plants to keep growing through winter season, these structures can protect them during dormancy. When overwintering plant life, minimize sunlight and keep maintaining adequate soil dampness. This ensures plant life won’t attempt to develop but don’t completely dry out either.
Harden off delicate vegetation and seedlings. Cold body greenhouses help plant life make the changeover from indoor plants to outdoor vegetation. Whether you started seedlings in your house or a greenhouse, plant life must gradually modify to the alter in temperature, sunlight, moisture, and exposure outdoors. With a cold frame, plants are controllably subjected to these adjustments, while still remaining sufficiently safeguarded. Once plants modify to the climate modify in your cold framework, after that transplant them to your backyard.
Cold framework greenhouses are relatively simple to use for just about any or all the reasons in the above list. However, keep these few tips in mind to be able to maximize the benefits of your structure.