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Vac & Air/Roots/Catalogue

Roots · Roots VJ Whispair exhauster performance data

VJ 821J

Data coverage & sourcesCompare this modelAsk about this model
BlowersOil-freeOEM data
Roots VJ 821J

*Photo shows another model from the Roots Blowers range, not this exact model. Image: Roots

Weight
816 kg

Headline ratings converted to common units for comparison; the table below shows each figure exactly as published.

Technical data

Source: Roots product page · retrieved 2026-10-04
As published1800 RPM, 16" Hg vacuum1800 RPM, 20" Hg vacuum1800 RPM, 22" Hg vacuum1800 RPM, 24" Hg vacuum1170 RPM, 16" Hg vacuum1170 RPM, 20" Hg vacuum1170 RPM, 22" Hg vacuum1170 RPM, 24" Hg vacuum850 RPM, 16" Hg vacuum850 RPM, 20" Hg vacuum850 RPM, 22" Hg vacuum850 RPM, 24" Hg vacuumvacuum (gauge); the pressure "Vacuum service inlet flow" is stated at (1800 RPM, 20" Hg vacuum)vacuum (gauge); the pressure "Vacuum service inlet flow" is stated at (1800 RPM, 16" Hg vacuum)vacuum (gauge); the pressure "Vacuum service inlet flow" is stated at (1800 RPM, 24" Hg vacuum)vacuum (gauge); the pressure "Vacuum service inlet flow" is stated at (1800 RPM, 22" Hg vacuum)as printed: "Approx. net Wgt (lbs.)"
Vacuum service inlet flow
Inlet flow (vacuum service)
2719 CFM
oem source
Source · 2026-10-04
2532 CFM
oem source
Source · 2026-10-04
2355 CFM
oem source
Source · 2026-10-04
2058 CFM
oem source
Source · 2026-10-04
1662 CFM
oem source
Source · 2026-10-04
1510 CFM
oem source
Source · 2026-10-04
1366 CFM
oem source
Source · 2026-10-04
1124 CFM
oem source
Source · 2026-10-04
1138 CFM
oem source
Source · 2026-10-04
1008 CFM
oem source
Source · 2026-10-04
885 CFM
oem source
Source · 2026-10-04
677 CFM
oem source
Source · 2026-10-04
Vacuum service brake horsepower
Brake power (vacuum service)
125.2 BHP
oem source
Source · 2026-10-04
151.9 BHP
oem source
Source · 2026-10-04
165.3 BHP
oem source
Source · 2026-10-04
178.6 BHP
oem source
Source · 2026-10-04
79.3 BHP
oem source
Source · 2026-10-04
97.5 BHP
oem source
Source · 2026-10-04
106.5 BHP
oem source
Source · 2026-10-04
115.6 BHP
oem source
Source · 2026-10-04
56.8 BHP
oem source
Source · 2026-10-04
70.2 BHP
oem source
Source · 2026-10-04
76.8 BHP
oem source
Source · 2026-10-04
83.5 BHP
oem source
Source · 2026-10-04
Reference vacuum
20 inHg
oem source
Source · 2026-10-20
16 inHg
oem source
Source · 2026-10-20
24 inHg
oem source
Source · 2026-10-20
22 inHg
oem source
Source · 2026-10-20
Weight
1800 lbs
oem source
Source · 2026-10-20

Original extracted values are shown with their source and review status. Multiple values under the same condition remain separate for review.

Same family: VJ 817J, VJ 826J, VJ 832J

Reviewed operating performance · 60 Hz

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Documents

Documents open on the manufacturer’s site.

Service parts

No parts published for this model.

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  • MissingA parts list for the VJ 821J

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