Reply letter problem

1. Please be informed that other series of carrier's indoor units such as ceiling types or cassette types and other brands of indoor units cannot suit in the new location as result of our investigation.

(The above sentences grammar of whether it correct or not.)


2.Noise level of fan(model: tgn354) is NC40. It exceeds the specification requirement of noise criteria NC35.

or Noise level of fan (model: tgn354) is NC40 in compliance with the specification requirement of noise criteria NC50.

(The above sentences grammar of whether it correct or not.)



3.However, the production of walkman (model: upe290) had been ceased. New model catalogue has not yet been received and we estimate the delivery period is 1 weeks subject to final approval.
or However, Sony's industry has ceased manufacturing the walkman (model: upe290). New model catalogue has not yet been received and we estimate the delivery period is 1 weeks subject to final approval.

or However, manufacturer has ceased the production of the model(upe290) of walkman.New model catalogue has not yet been received and we estimate the delivery period is 1 weeks subject to final approval.
(Which sentence is the best? or give me another sentence structure if you have.)

(Use "has ceased" or "had ceased" correct in the sentence?)




Please help me. Thanks