diff --git a/html/_data/quizzes/building-pressure.js b/html/_data/quizzes/building-pressure.js
index ed0b35b3..a27fe1ac 100644
--- a/html/_data/quizzes/building-pressure.js
+++ b/html/_data/quizzes/building-pressure.js
@@ -14,6 +14,19 @@
 // Quiz prose is painted post-load (the units walker doesn't reach it),
 // so measurements carry static metric parentheticals per the
 // metric-rounding policy — results close on the displayed operands.
+//
+// The bank is deliberately larger than the page's defaultCount (10):
+// the engine samples an overflowing bank, so each run draws a
+// different subset (buildQueue() in quiz-engine.js). Coverage tracks
+// the lesson's sections — the ledger and the positive setpoint, the
+// relief lineup down to return-fan tracking (why the offset is held
+// in flow, and what happens to a commissioned offset when the ledger
+// moves), power exhaust and its enable, the two ways the dampers
+// break the ledger plus the VAV wrinkle, and the measuring section:
+// probe placement, a windward outdoor reference, and building static
+// versus duct static. The duct-static question tests the "Not the
+// same pressure" callout, which carries no id of its own, so it
+// deep-links #measuring-it, the section that hosts it.
 
 module.exports = [
     // ── The air ledger ─────────────────────────────────────
@@ -67,6 +80,31 @@ module.exports = [
         learnMore: { href: '/education/building-pressure.html#relief-lineup', label: 'Building Pressure — The Relief Lineup' },
         tags: ['forced-air', 'building-pressure', 'relief']
     },
+    {
+        type: 'mcq',
+        id: 'bp-tracking-in-flow',
+        prompt: 'A built-up unit\'s return fan is set to <em>track</em> the supply fan at an offset. Why should that offset be held in measured flow rather than as a fixed speed difference?',
+        choices: [
+            { id: 'a', text: 'A fixed speed offset holds no particular CFM gap — the two fans ride different curves against resistances that drift independently.', correct: true },
+            { id: 'b', text: 'Drive speed feedback is too coarse to hold an offset that small — a few percent of speed disappears into the drive\'s own rounding and motor slip.' },
+            { id: 'c', text: 'A speed offset only works on constant-volume units; once the supply fan rides a VFD, the return fan has to match the supply fan\'s speed exactly.' },
+            { id: 'd', text: 'Flow is what the BMS trends and alarms on, so holding the offset in flow keeps the commissioning report and the sequence of operations in agreement.' }
+        ],
+        explain: 'The ledger is written in CFM, not RPM. The supply and return fans sit on different fan curves, pushing against resistances — filters loading, dampers moving — that change independently, so a fixed speed offset holds no particular flow difference at all; speed-offset tracking is the classic way this scheme gets botched. Measure both flows and hold the difference, and that difference <em>is</em> the ledger\'s balance, continuously, with no stages and no waiting for a pressure error to develop.',
+        learnMore: { href: '/education/building-pressure.html#relief-lineup', label: 'Building Pressure — The Relief Lineup' },
+        tags: ['forced-air', 'building-pressure', 'relief']
+    },
+    {
+        type: 'numeric',
+        id: 'bp-tracking-offset-sizing',
+        prompt: 'A return fan tracks its supply fan in measured flow. At commissioning the offset was set from the ledger: 1,500 CFM (2,550 m³/h) of restroom and janitor-closet exhaust that never returns to the unit, plus a 500 CFM (850 m³/h) surplus to hold the building positive. A year later a kitchen hood drawing 1,200 CFM (2,040 m³/h), with no makeup air of its own, is added on the same floors. What offset below supply flow must the return fan hold now, with the hood running? Enter the answer in CFM.',
+        answer: 3200,
+        tolerance: 50,
+        unit: 'CFM',
+        explain: 'The commissioned offset was the ledger of its day: 1,500 + 500 = 2,000 CFM (2,550 + 850 = 3,400 m³/h). The hood is a new withdrawal the unit must cover, so the offset becomes 2,000 + 1,200 = 3,200 CFM (3,400 + 2,040 = 5,440 m³/h). A fixed offset stays fixed when the ledger moves: left at 2,000, the return fan balances a ledger that no longer exists, and the building drifts negative every time the hood runs.',
+        learnMore: { href: '/education/building-pressure.html#relief-lineup', label: 'Building Pressure — The Relief Lineup' },
+        tags: ['forced-air', 'building-pressure', 'relief']
+    },
 
     // ── Power exhaust ──────────────────────────────────────
     {
@@ -142,6 +180,15 @@ module.exports = [
         learnMore: { href: '/education/building-pressure.html#dampers-pressure', label: 'Building Pressure — When the Dampers Move' },
         tags: ['forced-air', 'building-pressure', 'ventilation']
     },
+    {
+        type: 'tf',
+        id: 'bp-vav-deposit-moves',
+        prompt: 'On a VAV air handler with the outside-air damper parked at its minimum position, the outside air deposited on the building\'s ledger stays the same as the supply fan slows down.',
+        answer: false,
+        explain: 'False. On a VAV system the supply fan itself speeds up and slows down, so the ledger\'s deposit column moves with fan speed as well as with damper position — a damper parked at minimum is passing a share of a flow that is shrinking. The dedicated exhaust fans keep withdrawing exactly what they always did, so a building balanced at full flow can drift toward negative as the fan turns down. How VAV minimums handle that is covered in the VAV Systems lesson.',
+        learnMore: { href: '/education/building-pressure.html#dampers-pressure', label: 'Building Pressure — When the Dampers Move' },
+        tags: ['forced-air', 'building-pressure', 'vav']
+    },
 
     // ── Measuring it ───────────────────────────────────────
     {
@@ -158,4 +205,33 @@ module.exports = [
         learnMore: { href: '/education/building-pressure.html#measuring-it', label: 'Building Pressure — Measuring a Whisper' },
         tags: ['forced-air', 'building-pressure', 'sensors']
     },
+    {
+        type: 'gotcha',
+        id: 'bp-windward-reference',
+        prompt: 'A gusty afternoon, wind out of the west. A building-static loop modulates the exhaust fan\'s VFD, and the outdoor reference is a short open tube through the west wall. The tech on site wants to retune the loop: <em>it can\'t keep up.</em> The trend is below. What\'s the story?',
+        snippet: '<pre class="quiz-snippet">BLDG STATIC   +0.06 → −0.03 → +0.05 in. w.c.\n              (+15 → −7.5 → +12.5 Pa)  every few seconds\nEF-2 VFD       38 % → 92 % → 41 %\nOA DAMPER CMD  35 %\nSF-1 STATUS    ON</pre>',
+        choices: [
+            { id: 'a', text: 'The loop is tuned too slowly — raise the gain so the exhaust fan catches each swing before it grows.' },
+            { id: 'b', text: 'The envelope is too leaky to hold a setpoint — those swings are the building\'s real pressure.' },
+            { id: 'c', text: 'The exhaust fan\'s drive is hunting on its own, and the pressure reading is just following the fan.' },
+            { id: 'd', text: 'The bare tube on the windward wall reads gusts, not pressure — the loop is chasing weather.', correct: true }
+        ],
+        explain: 'The tell is how crisply it moves. Real building pressure is a whisper that shifts slowly with the ledger, and a breath of wind on the wrong wall face is bigger than the whole setpoint — so a bare tube on the windward wall reads wind, and the loop dutifully chases it with the fan. More gain (a) chases it harder. The fix starts at the reference: a shielded static-averaging tip, ideally sampling more than one face, then heavy filtering, a wide deadband (a band around setpoint where the loop holds still), slow loop action, and patient alarms. A pressure point that swings confidently is usually reporting on its own placement, not the building.',
+        learnMore: { href: '/education/building-pressure.html#measuring-it', label: 'Building Pressure — Measuring a Whisper' },
+        tags: ['forced-air', 'building-pressure', 'sensors']
+    },
+    {
+        type: 'mcq',
+        id: 'bp-duct-static-not-building',
+        prompt: 'The supply fan holds its duct static rock-steady at a 1.5 in. w.c. (375 Pa) setpoint, while the front doors stand open against their closers. What does the steady duct static tell you about the building pressure?',
+        choices: [
+            { id: 'a', text: 'Nothing — duct static is the fan\'s loop inside the ductwork; building static is space-to-outdoors.', correct: true },
+            { id: 'b', text: 'That the building is fine — a fan holding setpoint is delivering design air, so the ledger balances.' },
+            { id: 'c', text: 'That the building is positive by a similar amount, since the diffusers bleed duct pressure into the space.' },
+            { id: 'd', text: 'That the building sits near a fiftieth of it, about +0.03 in. w.c. (+7.5 Pa) — the usual ratio.' }
+        ],
+        explain: 'Two different pressures: duct static is the supply fan\'s control variable, measured inside the ductwork in whole inches; building static is the envelope\'s residual, measured space-to-outdoors in hundredths. Different magnitude, different sensor, different loop, different failure symptoms — a healthy duct static says nothing about the ledger. The doors are the witness here, and they say positive: look at the relief path and the dampers, not the fan\'s loop. (The lesson\'s fifty-to-one comparison shows how small the building signal is; it is not a relationship between the two.)',
+        learnMore: { href: '/education/building-pressure.html#measuring-it', label: 'Building Pressure — Measuring a Whisper' },
+        tags: ['forced-air', 'building-pressure', 'sensors', 'duct-static']
+    },
 ];