Modular drain pans for HVAC systems

A drain pan assembly for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:

• a drain pan including:
• a first end section including a first guide extension;
• a second end section including an integral drain port configured to direct fluid out of the drain pan and a second guide extension;
• and
• a middle section including a first wall and a second wall defining a cavity therebetween, wherein the cavity extends from a first end of the middle section to a second end of the middle section, and wherein the first end is configured to receive the first guide extension and the second end is configured to receive the second guide extension;
• a first support bracket having a first flat portion, a first leg, and a second leg, wherein the first leg and the second leg each extend from the first flat portion;
• and
• a second support bracket having a second flat portion, a third leg, and a fourth leg, wherein the third leg and the fourth leg each extend from the second flat portion, and wherein a distal end of each of the first leg, the second leg, the third leg, and the fourth leg is configured to engage an integral retention groove of the middle section.

A drain pan assembly for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:

• a drain pan comprising:
• a first end section including a first guide extension;
• a second end section including a second guide extension and an integral drain port configured to direct fluid out of the drain pan;
• and
• a middle section including a first wall and a second wall defining a cavity therebetween, wherein the cavity extends from a first end of the middle section to a second end of the middle section, wherein the first end is configured to receive the first guide extension and the second end is configured to receive the second guide extension, and wherein the middle section includes an integral retention groove configured to couple to a support bracket that is mounted underneath a heat exchanger of the HVAC system to enable the drain pan to capture fluid from the heat exchanger;
• and
• the support bracket, wherein the support bracket comprises:
• a flat portion having a first end and a second end, wherein the support bracket is configured to be mounted underneath the heat exchanger via the flat portion;
• a first leg extending from the first end and having a first retention flange;
• and
• a second leg extending from the second end and having a second retention flange, wherein the first retention flange is configured to engage with the integral retention groove on a first side of the middle section, and wherein the second retention flange is configured to engage with the integral retention groove on a second side of the middle section.