Features: Designed to fit today's narrower plenums, as narrow as 14" Reversible side panels with unique snap-lock fittings permit easy-change; left-side or right-side bypass installation New Summer Shutoff Damper--reduces bypass air through the humidifier during the summer months allowing the air conditioner to run more efficently and economically Improved wicking and water distribution system accommodates non-level plenums Frameless evaporator pad avoids breakage common to brands with plastic frames Barbed drain fitting prevents hose from slipping Stainless steel orifice won't break, cleans easily Internal solenoid - resists damage from bumping Durable thermoplastic cabinet resists rust, corrosion and warpage Low profile makes unit ideal where space is limited Output capacity of 18.0 gallons per day at 120 degrees Fahrenheit Includes installation template and owners manual Includes 6" start collar for bypass connection Includes 24Volt Transformer Includes Self-Piercing Saddle Valve Includes SEH-7100-000 "Computsat" humidistat - electronic compensating humidistat which automatically adjusts the humidifier output to compensate for changes in outdoor temperature (outdoor sensor included). It helps prevent over-humidification in the event of a sudden outside temperature drop.