Some SQweet Upgrades for Greenheck Square Inline Fans!
You all know the Greenheck SQ square inline fan. It and its belt drive brother the BSQ have been around for decades. It was due for an upgrade, so Greenheck packed a whole lot of innovation into a cube. What’s so SQweet about it?
New Mixed Flow Wheel for Direct Drive SQ
The new SQ fan uses a mixed flow fan wheel for better efficiency and lower sound. A typical selection (straight out of eCAPS (https://ecaps.greenheck.com/), you could try this right now) might be 4500 cfm @ 1.0” w.c. at 5300’ a.s.l:
| Model | Drive Type | Brake Horsepower | Motor Size | FEI | Budget Cost | Inlet dBA |
| SQ-16-07-0700-A | Direct | 1.24 | 1.5 | 1.29 | $1,994.00 | 69 |
| BSQ-180-20 | Belt | 1.72 | 2 | 1.00 | $1,834.00 | 71 |
Some of the is belt loss and some of the difference is fan efficiency. It won’t always save a motor size, but for static pressures up to 1.5”, you can expect higher efficiency. Above 2” static pressure, you may see better options with the belt drive BSQ.
Also, plan to see smaller fan diameters as compared to centrifugal fans. In general, a mixed flow impeller will end up being 2” or 4” smaller than a centrifugal impeller for the same duty.
SQweet!
New Better Access Housing with Flange Mount
In order to maximize access and airflow, Greenheck redesigned the new SQ housing with structural members and removable panels. The two airflow faces are ready to receive duct flanges for a quicker installation.
SQweet!
Available Vari-Green 3-phase Motor with IE5 Efficiency
For single phase applications, you should already be familiar with your Greenheck Vari-Green® options.
For three phase applications, you can either select a NEMA Premium induction motor (the product code will end with a letter A, B, C) or an IE5 EC Titanium Motor with integrated VFD (the product code will end with a –VG).
If you select a –VG fan, then all the available VG options are in place. Right out of the box, it’s ready to accept a 2-10VDC or 4-20mA control signal for speed, or balance with a simple dial. Or you can apply a Greenheck controller (non-DDC) for constant airflow, constant pressure, 2-speed, or any other Greenheck application specific controller.
SQweet!
Stay out of the ditch!
With all direct drive fans, please double check your operating curve against the maximum rpm of the motor and allow for additional static pressure at the design cfm. It’s always smart to have additional static pressure for a field-added duct offset.
Pick the Best Value (SQweetest) Fan:
The best way to see all of your options in eCAPS is this:
The key thing for the 3-phase motors is to select “Apply VFD” and then “Both” for overspeed and underspeed. You’ll see everything this way. If you’re sure you want a VG fan with integral speed control, then select Vari-Green under “Drive Type.”