The “front” of your Bullfrog Spa requires a removable access panel. This panel allows access to service the spas pumps, heater, etc.
The removable panel is shown in pink in the drawing below. It is constructed of 2×6 framing and drops into Simpson 2×6 joist hangers. It lifts out of the joist hangers and does not require tools to move.
*On a larger 8′ spa, the long joists may be 2×8 or 2×10 instead of 2×6.