heating registers near the floor, whether moving heated air “down” in ducts negatively
affects blower performance. My recommendations are as follow: I can find nothing in either Carrier, Trane,
have references to it.
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I cannot see any advantage to low sidewall application. The problem is injection and pattern. I do see an advantage to low sidewall return; Carrier Design Manual—Air Distribution is a good reference on both items.
信尾敬语 (complimentary close)
Next
签名 (signature)
缩写名、附件及分送标志部分
（IEC: initials, enclosures and carbon copies block）
附言 ()
2
商务信函实例1
Kee & Co., Ltd 34 Regent Street London, UK Inside Address 收信人地址 Dear Sirs，Salutation称呼
efficiency.
If your prices are competitive we would expect to place volume orders on you.
We look forward to your early reply.
Yours faithfully, Complimentary Close客套结束语
or ASHRAE design manuals that indicates drop as being a factor in duct design any
different from normal static losses. If you have different information on this, I would like to
3
We have been importers of shoes for many years. At present, we are interested in extending our range and would appreciate your catalogues and quotations.
Dear Mr. Ptricks, I received your June 5th letter requesting consultation
and am providing my recommendation in the following.
First, let me review my understanding of your inquiry. The question you raise revolves around whether the heating registers should be located in a low sidewall, or in the ceiling,
I recommend step-down diffusers with OBD because they have pattern and volume control that is superior to stamped-faced diffusers.
I am opposed to low sidewall diffusers or floor diffusers in the application you describe. The increased static losses that result from trying to get the ducts to down through the walls will only increase installation cost and reduce
第三章 涉外商务信函的翻译
1
第一节 商务信函简介
一 商务信函的12种要素
信头（letterhead）
案号 (reference)
日期 (date)
封内地址 (inside address
注意项 (attention line)
称呼 (salutation)
事由栏 (subject)
信的正文 (body of letter)
5
and if ceiling registers are used, which type – step –down or stamped-faced—will deliver
the best results. Additionally, the problem concerns whether there is any benefit to have
We have obtained your name and address from Dee&Co. Ltd, and we are writing to enquire whether you would be willing to establish business relations with us.
Tony Smith Signature Block签名栏 Enc: invoice for consulting services Enclosure Notation
4
商务信函实例2
1117 The High Road Austin TX 78703 6 June 2006
MR. David Patricks 3005 West 29th, Suite 130 Waco. TX 77663