A linear supply outlet system and related devices and methods for efficiently passing air into an indoor space while integrating heating and cooling fenestrations with architectural appearances, comprising: an active register comprising: an active fenestration projection comprising a width thereof no smaller than ⅜″ and no larger than ⅞″, culminating in an airflow opening at a forward extremity of the active register; an active register mounting flange recessed rearward of the airflow opening; and at least one duct connection fabricated to connect with an SDHV duct; and a passive register-connector comprising: a passive fenestration projection comprising a width thereof which is equal to the width of the active fenestration projection, culminating in a dummy opening at a forward extremity of the passive register-connector; a passive register-connector mounting flange recessed rearward of the dummy opening; and omitting any duct connection for connecting with an airflow duct.
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