Fan mounting assembly systems and methods

A mounting assembly for a fan of a heating, ventilation, and/or air conditioning (HVAC) system, comprising:

• a frame defining an interior volume and comprising a first end configured to receive the fan and a second end opposite the first end;
• a support rail coupled to the frame, wherein the support rail comprises a flange and a tongue extending obliquely from the flange;
• a plurality of guide rails coupled to the frame, wherein each guide rail of the plurality of guide rails comprises a guide surface configured to guide translation of the fan through the first end of the frame, into the interior volume toward the second end of the frame, and into engagement with the tongue, wherein the tongue is configured to guide translation of the fan atop the flange, with respect to a direction of gravity, such that the fan is positioned in a first orientation;
• and
• a retention system configured to engage the fan to secure the fan in a second orientation within the interior volume, wherein the fan is disposed at an angle relative to the guide surfaces in the second orientation, and wherein the retention system and the flange are configured to support a weight of the fan in the second orientation.