A snap-mount blanking panel for an equipment rack or cabinet enclosure has ergonomic grips spaced laterally inward to permit comfortable and reliable mounting and removal of the blanking panel regardless of lateral clearance. Resiliently flexible sealing skirt members create a positive seal with adjacent electronic devices or blanking panels. Stacking structure enables stable stacking of multiple units outside a container. An off-set platform allows for mounting ambient atmospheric indicators or signage, or may be used as a writing surface. A cable pass-through is also provided.