Patent ID: 8464480

Claim:
A modular fenestration system comprising: a collection of individual functional window units including a plurality of functional window units having different configurations with the functional window units of at least some of the different configurations having a plurality of different sizes, the individual functional window units each comprising a frame having a frame perimeter and a groove formed in the frame perimeter; a common mulling system configured to mull together individual functional window units selected from the collection to form a compound functional unit; the mulling system comprising a first mulling member configured to be attached to the frame perimeter of one functional window unit of the collection with part of the first mulling member extending into the groove thereof and a second mulling member configured to be attached to the frame perimeter of another functional window unit of the collection with part of the second mulling member extending into the groove thereof; the first and second mulling members being configured to couple and lock together to combine functional window units of the collection into the compound functional unit; the functional window units of the collection being configured such that, when combined, the resulting compound functional unit exhibits a predetermined set of common physical features regardless of which functional window units of the collection are selected to form the compound functional unit; a plurality of architecturally distinct exterior trim units configured to be selectively attached at least to some of the individual functional window units and to compound functional units assembled therefrom; a common attachment mechanism for attaching exterior trim units to the functional window units and to compound functional units assembled therefrom; a plurality of architecturally distinct grille units each configured to be secured to at least some of the individual functional window units; a common attachment mechanism for attaching selected grill units of the plurality of grill units to the functional window units; and a plurality of architecturally distinct hardware units configured to be selectively secured to at least some of the individual functional window units.