CFM-88L 07/20/0914
9.0 FLOWHOOD ASSEMBLY
9.1 UNPACKING
The FlowHood case has been specifically designed for the most efficient storage and handling of the FlowHood unit and
its accessories. Note the arrangement of the various items as the unit is unpacked. Especially note the placement of the
foam cushioning around the instrument, and the orientation of the meter face toward the side of the case. The FlowHood
should be packed in exactly the same manner whenever it is returned for recalibration. Save the foam packing and carton
for this purpose.
The base assembly and 2'x2' top assembly will arrive already assembled as a unit and packed as shown in Figure 9.1. The
handle assembly, accessory tops, and support dowels are enclosed in the built-in storage compartment at the rear of the
carrying case. The frame channels for the accessory top assemblies are stored at the bottom of the carrying case beneath
the frame storage retainers as shown in Figure 9.2. The top support assembly is stored in the top of the base assembly
just above the grid. The legs have been folded upward, and the curved sections at the bottom of the legs have been
inserted into the first and the third holes of the corner tubes of the base. The head of the top support assembly should be
positioned toward the back of the base assembly. The four spring rods are positioned downward, so that they do not directly
contact the flow sensing grid. Foam packing, cloth skirts and accessories should not be stored on top of the grid.
9.2 FRAME ASSEMBLIES
FlowHood system kits include frames for up to six standard top sizes. Custom top sizes are available upon request. The
2'x2' and 14"x14" top frames are assembled and stored as complete units. The 2'x4', 1'x4', 1'x5', and 3'x3' frames use
interchangeable parts to construct any of the four sizes. Refer to Figures 9.4 through 9.8 to determine the frame channels
needed to assemble any of the standard size frames. Each frame corner section utilizes an eyelet and slot arrangement
which self-locks into a similar eyelet and slot on the corresponding frame channel, when the two pieces are slid together.
Side extension channels are joined together by a thumbnut and splice angle arrangement.
The individual frame pieces are stamped with a frame number, as shown circled below. A corresponding red part number
label is glued to each frame piece.
1'x4' Use two part no. 141
â, two part no. 142 ã, and two part no. 143 ä frames.
2'x4' Use two part no. 141
â, two part no. 142 ã, and two part no. 244 å frames.
1'x5' Use two part no. 141
â, two part no. 142 ã, two part no. 143 ä and two part no. 155 æ frames.
3'x3' Use four part no. 141
â, and four part no. 336 ç frames.
Frame pieces should be stored in the frame storage retainers at the bottom of the carrying case when not being used. This
will help to avoid damage or loss.
9.3 FABRIC TOPS
The top size has been stamped on each FlowHood fabric top (the 2'x2' top has been imprinted with the FlowHood logo).
The desired top is attached to the matching frame assembly by pressing the corded hem of the top into the U-shaped
retention channels on the outside of the frame assembly. After the top is attached to the frame assembly, the similarly
corded hem on the lower edge of the fabric top is pressed into the retention channels on the upper edge of the base
assembly. The seams of the fabric top must always be placed at the corners of both the frame and base assemblies.
9.4 TOP SUPPORT ASSEMBLY
The top support assembly and support dowels are assembled as shown in Figure 9.3. Position the top support assembly
so that the spring rods are at the top. Swing the long rods around and down, into the position shown, and insert the ends
of the rods into the center hole of the corner tubes of the FlowHood base. The rod ends may be moved upward or
downward as needed to control the tightness of the fabric top. The support dowels can now be slid over the ends of the
spring rods.
The location and correct combinations of frames, support dowels, dowel extenders and frame support cups to be used with
each size are shown in Figures 8.4 through 8.8. The 8.5" dowel extenders are used with the 23.5" fiberglass support dowels
when necessary to adjust for variations in frame size.
The 2'x2', 2'x4' and 1'x4' tops do not require dowel extenders. When using the 2'x2' frame, insert the support dowel end
pins into each corner bracket of the 2'x2' frame assembly as shown in Figure 8.4. The dowel end pins are inserted into the
outer set of frame support cups when assembling a 1'x4' top and into the inner set when assembling a 2'x4' top as shown
in Figures 9.5 and 9.6. The 1'x5' top requires an 8.5" dowel extender at the bottom of each support dowel. The dowel end
pins are to be inserted into the inner set of frame support cups as shown in Figure 9.7.
The 3'x3' top requires dowel extenders added to both the top and bottom of the support dowels. The dowel end pins are
to be inserted into the frame corner brackets as shown in Figure 9.8. Each frame piece has been labeled to indicate
positioning of the support dowels for different frame sizes.
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