Electric heat pumps must be tested to UL 559 or UL 1995 standards. A 3.5 tonne heat pump is an example. For each 1000 BTU of cooling, the duct for this system must be sized utilising 6 square inches of transparent duct space. 12,000 BTU are contained in each tonne of cooling.
Return ducts are typically found in corridors, under stairwells, or in more open parts of your property. They must be properly installed and unobstructed. This positioning assures that they will be able to pull in sufficient air to return to the HVAC equipment.
Your Return Ducts' Dimensions:
If you're only installing one or two return vents, a 12-inch return is recommended for 2-ton and lesser units. For ages 3 and above, 14 inches is recommended. For 4 tonne systems, 16-inch returns should suffice, however 5 tonne systems may require 18-inch returns.
No, except in extreme instances where a closed chamber is temporarily under negative air pressure, an air return cannot be too large. Return vents are essential to the proper operation of any HVAC system because they maintain air pressure and filter out waste.
Learner's Ratings
4.5
Overall Rating
77%
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Reviews
S
sandhani sayyad
5
Good
S
SK
5
it's very usefull course from begning basic to advance level but sir please provide excel sheets for heat calculation
T
Tushar RavindraKumar Chaurasia
5
very easy to learn, simple language and best understanding though video series
best for a HVAC technician and engineer
A
Abdul Majed
5
This course is undoubtedly time effective and beginner friendly.
S
Syed anwar
4
Hello
S
SHOAIB AKHTAR
5
It's very important for ac technician
S
Syed Sabeel
5
Sir where can I get this drawing auto cad final drawing
Z
Zakir Ullah
4
I love this course. Everything is made clear.
M
Md Akbar
5
HVAC TECHNICIAN knowledge video
K
Kazi Mohd Qamar
4
so far,the course and content is good,teacher is looking a bit unexperienced and anxious
,you need to do practice by yourself too.mail me qaziqamar487@gmail.com for 2017 databook of ISHRAE
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