ASHRAE Journal - August 2024 - 16
HVAC FUNDAMENTALS
Column
Creating a Clean, Safe, Productive Workspace
Dust Collector
Design Demystified
BY CHRIS JESTER, ASSOCIATE MEMBER ASHRAE; CALEB DECK, P.E., ASSOCIATE MEMBER ASHRAE
Dust collecting is the process of collecting potentially dangerous dust from an area
and storing it to be disposed of later. This could range from a high school woodshop
to an industrial metal fabrication plant. It is not just wood dust that you could be
collecting, either. It could be aluminum dust, cotton dust or soap dust. (Yes, even soap
can be flammable.) Proper measures must therefore be taken in the design of the
collection system.
Table 1 shows the Kst value-how explosive a dust
can be when suspended in air-for common dusts. If
a dust has a Kst value greater than 0, it is considered
combustible, and code for combustible dust collection
must be followed. (If you are designing a dust collection
system for noncombustible dust, many of the strict code
requirements do not apply.)
Air Velocity and Duct Sizing
The first and most important design criteria in an
operational dust collection system is air velocity within
the duct. No other design tips matter if the collector fails
at its primary goal of moving dust. An industry standard
air velocity is 4,000 ft/min (20 m/s). This velocity
ensures that the dust does not ever slow down enough to
begin to clog the ducts. Minimizing the amount of duct
turns also helps prevent clogging.
To ensure proper air speed, we must know the total
cfm for the system. To determine that, we must sum
all the pieces of equipment needed for dust collection.
16
ASHRAE JOURNAL ashrae.org A U G UST 2024
The best way to find how much cfm of dust collecting
a particular machine requires is to refer to the specific
product data catalog for that unit. However, that specific
information is not always available. Thus, there are
some typical airflow values for common machines
(Table 2).
After knowing how much air each piece of equipment
requires, we can size each individual branch to maintain
the 4,000 ft/min (20 m/s) air speed requirement. To
size the main duct, we must consider the use rates for
each piece of equipment. It is detrimental to oversize
the main duct and dust collector. Not every piece of
equipment will be on at the same time. If the main duct
is sized for full possible flow, then, when the system
is in partial use, the air speed in the main duct will
slow down, and the dust will fall out of the airstream
and begin to block the duct. Therefore, it is crucial to
determine the use rate for each machine.
Chris Jester is a mechanical designer and Caleb Deck, P.E., is the sustainability lead at
FSB Architects and Engineers in Oklahoma City, Okla.
http://www.ashrae.org
ASHRAE Journal - August 2024
Table of Contents for the Digital Edition of ASHRAE Journal - August 2024
Contents
ASHRAE Journal - August 2024 - Intro
ASHRAE Journal - August 2024 - Cover1
ASHRAE Journal - August 2024 - Cover2
ASHRAE Journal - August 2024 - 1
ASHRAE Journal - August 2024 - Contents
ASHRAE Journal - August 2024 - 3
ASHRAE Journal - August 2024 - 4
ASHRAE Journal - August 2024 - 5
ASHRAE Journal - August 2024 - 6
ASHRAE Journal - August 2024 - 7
ASHRAE Journal - August 2024 - 8
ASHRAE Journal - August 2024 - 9
ASHRAE Journal - August 2024 - 10
ASHRAE Journal - August 2024 - 11
ASHRAE Journal - August 2024 - 12
ASHRAE Journal - August 2024 - 13
ASHRAE Journal - August 2024 - 14
ASHRAE Journal - August 2024 - 15
ASHRAE Journal - August 2024 - 16
ASHRAE Journal - August 2024 - 17
ASHRAE Journal - August 2024 - 18
ASHRAE Journal - August 2024 - 19
ASHRAE Journal - August 2024 - 20
ASHRAE Journal - August 2024 - 21
ASHRAE Journal - August 2024 - 22
ASHRAE Journal - August 2024 - 23
ASHRAE Journal - August 2024 - 24
ASHRAE Journal - August 2024 - 25
ASHRAE Journal - August 2024 - 26
ASHRAE Journal - August 2024 - 27
ASHRAE Journal - August 2024 - 28
ASHRAE Journal - August 2024 - 29
ASHRAE Journal - August 2024 - 30
ASHRAE Journal - August 2024 - 31
ASHRAE Journal - August 2024 - 32
ASHRAE Journal - August 2024 - 33
ASHRAE Journal - August 2024 - 34
ASHRAE Journal - August 2024 - 35
ASHRAE Journal - August 2024 - 36
ASHRAE Journal - August 2024 - 37
ASHRAE Journal - August 2024 - 38
ASHRAE Journal - August 2024 - 39
ASHRAE Journal - August 2024 - 40
ASHRAE Journal - August 2024 - 41
ASHRAE Journal - August 2024 - 42
ASHRAE Journal - August 2024 - 43
ASHRAE Journal - August 2024 - 44
ASHRAE Journal - August 2024 - 45
ASHRAE Journal - August 2024 - 46
ASHRAE Journal - August 2024 - 47
ASHRAE Journal - August 2024 - 48
ASHRAE Journal - August 2024 - 49
ASHRAE Journal - August 2024 - 50
ASHRAE Journal - August 2024 - 51
ASHRAE Journal - August 2024 - 52
ASHRAE Journal - August 2024 - 53
ASHRAE Journal - August 2024 - 54
ASHRAE Journal - August 2024 - 55
ASHRAE Journal - August 2024 - 56
ASHRAE Journal - August 2024 - 57
ASHRAE Journal - August 2024 - 58
ASHRAE Journal - August 2024 - 59
ASHRAE Journal - August 2024 - 60
ASHRAE Journal - August 2024 - 61
ASHRAE Journal - August 2024 - 62
ASHRAE Journal - August 2024 - 63
ASHRAE Journal - August 2024 - 64
ASHRAE Journal - August 2024 - 65
ASHRAE Journal - August 2024 - 66
ASHRAE Journal - August 2024 - 67
ASHRAE Journal - August 2024 - 68
ASHRAE Journal - August 2024 - 69
ASHRAE Journal - August 2024 - 70
ASHRAE Journal - August 2024 - 71
ASHRAE Journal - August 2024 - 72
ASHRAE Journal - August 2024 - Cover3
ASHRAE Journal - August 2024 - Cover4
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ATMAHK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VHQRAW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XGMDXI
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_YELQLJ
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QJLWMC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_MCDEBX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WNYSQY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XATVOD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FJSHSS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CCBZDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XDEFVG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2023november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2023november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VHGNBL
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WPKBNJ
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_UUVCDE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTGDEW
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2023
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LKRFXS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_AZSOFG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ERCDBH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QWDFRV
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JHGVDF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPUYHG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SREIBM
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LRTGLK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OKRFGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2022november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2022november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TZSERA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LVRUIX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RPTVYZ
https://www.nxtbook.com/nxtbooks/ashrae/mini_pub_catalog
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XIYTGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2022
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RFGDOB
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PABXNU
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_REMKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PICVBT
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_AOYTVW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JQOPLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IOYTBC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SGAJJF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IGHYER
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PDRKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XCODFR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QSLFGO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ILKVNM
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2021
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPDJKD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VJKSRY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDHUTC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JPPKRR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDLTTH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CKLLES
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SLDOX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_HJETUK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OLUHGE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ZERDGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QVMNEO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTPOKE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_BBATRE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_STUBMW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TPEMPE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JNMKDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FBTTPA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WQMMNE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TVBRYN
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2020
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_KTUZMA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ABEDGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201910
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201909
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019septmeber_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019september
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201908
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201907
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201906
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201905
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201904
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019april
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201903
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019march
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201902
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201901
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2019
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018december
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018october
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2018
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201810
https://www.nxtbook.com/nxtbooks/ashrae/ashraeinsights_201806
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201805
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201804
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201803
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201712
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201711
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201710
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201709
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201705
https://www.nxtbook.com/nxtbooks/ashrae/ashrae_meetinginsert_201610
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acrexindia
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer
https://www.nxtbook.com/nxtbooks/amca/2014summer2
https://www.nxtbook.com/nxtbooks/amca/2014summer
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acma_2014summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201311
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201309
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acmasupp_2013fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201305
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201303
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2013winter
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201211
https://www.nxtbook.com/nxtbooks/ashrae/achr_expo_mexico2012
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201209
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v3
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201205
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201203
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012winter
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201111_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201109_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2011summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201105
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201103
https://www.nxtbookmedia.com