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Christopher Borcsok
Senior Member
Username: ckb

Post Number: 27
Registered: 06-2013
Posted on Wednesday, February 05, 2014 - 09:21 am:   Edit PostDelete PostPrint Post

Part of this question has to do with the fact that the HVAC industry does not use uniform terminology, and doesn't correlate with the names that MasterFormat uses, and I'm struggling to reconcile the two.

MasterFormat 2004 (and looking back, 1995 also) make a distinction between fuel-fired heaters, and all other heaters.

23 55 23 Gas-Fired Radiant Heaters
23 83 16 Radiant-Heating Hydronic Piping
23 83 33 Electric Radiant Heaters

23 55 33 Fuel-Fired Unit Heaters
23 82 39 Unit Heaters
Everything under 23 82 00 includes terminal units with water, steam, and electric coils.

Anyway, the heaters that I seem to see spec'd the most often are:
Electric Baseboard Heaters - buried in the keyword index I've found it as 23 83 33 - Convectors. Also, hot water baseboards would fall under 23 83 16 - Air Coils.

Forced Flow Heaters. Based on the keyword index, it lists wall insert unit heaters under Section 23 82 39, or possibly with level 4 number .19.

What I cannot figure out is Electric (or non-fuel fired) Duct Heaters:
23 55 13 Fuel-Fired Duct Heaters
A little google searching has turned up a large number of options based on existing numbers, or user defined numbers.
23 55 01
23 82 16.14
23 82 33
23 82 41
23 82 43.00

Any suggestions?
Michael Heinsdorf, P.E.
Senior Member
Username: michael_heinsdorf_pe

Post Number: 11
Registered: 01-2014
Posted on Wednesday, February 05, 2014 - 09:32 am:   Edit PostDelete PostPrint Post

MasterSpec TOC has Section 235413.00 Electric-Resistance Furnaces, also 238239.13 - Cabinet Unit Heaters. I think either or both would cover what you're looking for, but don't take my word for it as I'm an electrical guy.

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