Caution, This appliance cannot be vented horizontally – Lennox International Inc. MERIT PLUS MPB3530CNM-B User Manual

MERIT PLUS MPB4540CNM-B, MERIT PLUS MPB4035CNE-B, MERIT PLUS MPB4540CNE-B, MERIT PLUS MPB3530CNE-B, MERIT PLUS MPB3530CPM-B, MERIT PLUS MPB3328CNM-B, MERIT PLUS MPB3328CPM-B, MERIT PLUS MPB4035CNM-B, MERIT PLUS MPB3328CNE-B