久久久久久亚洲,伊人久久综合无码成人网,人妻丰满熟AV无码区HD,免费男人和女人牲交视频全黄

Spiral Duct Sales Hotline:0757-8679-7137

Advantages and disadvantages of elliptical spiral air duct

  • Hits: 799

Nowadays, the shape of domestic ventilation pipe is generally rectangular and round. Generally, the raw materials are galvanized steel plate and stainless steel plate. A new type of air duct produced by oval air duct is mainly developed on the basis of round air duct. Oval air duct absorbs the advantages of rectangular and circular spiral air ducts, and is gradually widely used in household air conditioning ventilation ducts, and it is also a kind of spiral air duct with high frequency. Let's talk about some of the advantages of elliptical spiral pipes.

1. The elliptical spiral pipe has a longer size. Compared with the rectangular air pipe, the difficulty of manual connection and the chance of air leakage at the interface are reduced to a certain extent. Its continuous spiral structure will not leak even if it does not need leak proof glue.

2. The internal structure of the passage is lubricated, without eddy current, which can reduce the air friction loss and noise.

3. There is no leakage due to tight screw engagement, which has the effect of strengthening ribs and improving the strength of spiral air duct. For this reason, a thin galvanized sheet can be selected.

4. It is made by machinery. The size of air duct needs to be unified. The maximum length can reach 12m. It is simple to connect and easy to operate on site.

5. The occupied space is small, and the ceiling space can be fully utilized by increasing the floor height to save project investment. This is more suitable for central air conditioning and ventilation system.

It has some disadvantages:

Compared with the processing of rectangular and circular spiral pipes, the processing of elliptical spiral pipes is relatively messy. The oval flange processing is more difficult.

QQ
WEIXIN
">
WEIXIN
0757-86797137
">
TEL
亚洲av熟女| 欧美激情一区二区久久久| 91在线一区二区| 国产午精品午夜福利757视频播放 亚洲成A人片在线观看高清 | 东京热av| 亚洲精品污一区二区三区| 日日碰日日摸日日澡视频播放| 黄色一级片网站| 亚洲精品乱码久久久久久按摩| JIZZJIZZ亚洲日本少妇| 宁河县| 久久热在线播放| 国产精品久色在线播放| 人妻在厨房被色诱中文字幕| 美女又黄又免费的视频| 国产婷婷成人久久Av免费高清| 国产精品欧美一区二区三区不卡| 日本乱妇bbwbbw| 在线播放一区| 国产一区二区三区精品推荐| 亚洲成a人片在线播放| 国产精品久久无码一区二区三区网 | 97zyz| 欧美免费视频| 国产精品一区二区久久不卡| 樱桃熟了A级毛片| xxxx18一20岁hd第一次| 99久久精品国产一区二区蜜芽| 万全县| 久久精品国产亚洲AV麻豆~| 久视频在线| 国产精品欧美一区二区三区不卡| 亚洲专区| 亚洲精品1区| 一级特黄片| 男男暴菊GAY无套网站| av区无码字幕中文色| 无码中文字幕乱码| 人人妻人人澡人人爽人人精品97| 超碰人人超碰人人| 高清一区二区三区免费视频|